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Search for "sensitivity" in Full Text gives 701 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Fragmentation of metal(II) bis(acetylacetonate) complexes induced by slow electrons

  • Janina Kopyra and
  • Hassan Abdoul-Carime

Beilstein J. Nanotechnol. 2023, 14, 980–987, doi:10.3762/bjnano.14.81

Graphical Abstract
  • nanocrystals [13][14]. The popularity of these compounds is related to their volatile nature, ease of preparation, and often lower air sensitivity and toxicity in comparison to organometallic compounds containing carbon–metal bonds (e.g., metallocenes). In the context of a potential use of these organometallic
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Published 26 Sep 2023

Antibody-conjugated nanoparticles for target-specific drug delivery of chemotherapeutics

  • Mamta Kumari,
  • Amitabha Acharya and
  • Praveen Thaggikuppe Krishnamurthy

Beilstein J. Nanotechnol. 2023, 14, 912–926, doi:10.3762/bjnano.14.75

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  • effect makes the NPs very selective and provides a high sensitivity for binding on the target surface. Multicomponent effect of protein corona on antibody-conjugated NPs The small hydrodynamic diameter and unique structure of NPs offer increased adsorption and catalytic efficiency. The NP surface
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Published 04 Sep 2023

A wearable nanoscale heart sound sensor based on P(VDF-TrFE)/ZnO/GR and its application in cardiac disease detection

  • Yi Luo,
  • Jian Liu,
  • Jiachang Zhang,
  • Yu Xiao,
  • Ying Wu and
  • Zhidong Zhao

Beilstein J. Nanotechnol. 2023, 14, 819–833, doi:10.3762/bjnano.14.67

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  • , respectively, 2.4 times and 1.6 times greater than those of pure P(VDF-TrFE) nanogenerators [14]. Subash et al. added ZnO nanoparticles and exfoliated graphene oxide to P(VDF-TrFE) to prepare a composite nanofilm with excellent touch sensitivity and high output energy. They also used the piezoelectric film for
  • feature that mimics the sensitivity of sound signals of different frequencies in the human ear, based on the hearing mechanism. Extracting MFCC features is useful for modeling heart sound signals. The wavelet feature extraction method uses “db6 wavelet decomposition” to generate seven feature vectors. The
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Published 31 Jul 2023

Silver-based SERS substrates fabricated using a 3D printed microfluidic device

  • Phommachith Sonexai,
  • Minh Van Nguyen,
  • Bui The Huy and
  • Yong-Ill Lee

Beilstein J. Nanotechnol. 2023, 14, 793–803, doi:10.3762/bjnano.14.65

Graphical Abstract
  • detection of harmful chemicals in the environment and for food safety is a crucial requirement. While traditional techniques such as GC–MS and HPLC provide high sensitivity, they are expensive, time-consuming, and require skilled labor. Surface-enhanced Raman spectroscopy (SERS) is a powerful analytical
  • technique in various biochemical applications because of its exceptional sensitivity and the capabilities of real-time analysis and label-free detection [1][2]. SERS has been used to identify targets for single molecules in chemical and biological systems [3][4] since its discovery by Martin Fleischmann in
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Published 21 Jul 2023

Cross-sectional Kelvin probe force microscopy on III–V epitaxial multilayer stacks: challenges and perspectives

  • Mattia da Lisca,
  • José Alvarez,
  • James P. Connolly,
  • Nicolas Vaissiere,
  • Karim Mekhazni,
  • Jean Decobert and
  • Jean-Paul Kleider

Beilstein J. Nanotechnol. 2023, 14, 725–737, doi:10.3762/bjnano.14.59

Graphical Abstract
  • enhancing device efficiency [10][11]. Consequently, the experimental demonstration of the sensitivity of KPFM to the narrower layers can be crucial for the investigation and comprehension of local surface properties and charge transport mechanisms at interfaces [12]. Within this context, this work presents
  • qualitative analysis. KPFM successfully detects the n-InP substrate (from 0 to 0.46 μm), the InP:nid/GaInAs:nid region (from 0.46 to 1.12 μm), the InP:Zn region (from 1.12 to 2.87 μm), and the GaInAsP:Zn/GaInAs:Zn region (from 2.87 to 3.09 μm). KPFM demonstrated a strong sensitivity on the local doping
  • . The verified sensitivity of our KPFM setup to the narrower layers will be crucial for the study of the cross sections of operating solar device in future works. The analysis of the surface potential profile identified the presence of space charge regions and, thus, the formation of several junctions
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Published 14 Jun 2023

A graphene quantum dots–glassy carbon electrode-based electrochemical sensor for monitoring malathion

  • Sanju Tanwar,
  • Aditi Sharma and
  • Dhirendra Mathur

Beilstein J. Nanotechnol. 2023, 14, 701–710, doi:10.3762/bjnano.14.56

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  • working electrode has an increased surface area to volume ratio due to the small size of GQDs. In addition, the different functional groups present on the GQDs surfaces provide additional active sites, which increase sensitivity and lower the limit of detection. Interference study The selectivity of the
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Published 09 Jun 2023

Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review

  • Akeem Adeyemi Oladipo,
  • Saba Derakhshan Oskouei and
  • Mustafa Gazi

Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52

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  • antibiotics and hormones in the environment and food samples are concerning and pose a threat. Opto-electrochemical sensors have received attention due to their low cost, portability, sensitivity, analytical performance, and ease of deployment in the field as compared to conventional expensive technologies
  • detection (LOD), and are selective in many cases. However, they have a number of shortcomings. For example, in order to increase the sensitivity of the established immunoassays, Mitchell and Lowe [20] and Wu et al. [21] used the ELISA technique for the analysis of testosterone and progesterone, respectively
  • . Even though this sensitive ELISA approach provided the necessary sensitivity for hormone detection in biological samples, it had a number of drawbacks, including limited specificity, high cost, cross-reactivity, and significant kit variability. The conventional ELISA method necessitates a laborious
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Published 01 Jun 2023

Titania nanoparticles for photocatalytic degradation of ethanol under simulated solar light

  • Evghenii Goncearenco,
  • Iuliana P. Morjan,
  • Claudiu Teodor Fleaca,
  • Florian Dumitrache,
  • Elena Dutu,
  • Monica Scarisoreanu,
  • Valentin Serban Teodorescu,
  • Alexandra Sandulescu,
  • Crina Anastasescu and
  • Ioan Balint

Beilstein J. Nanotechnol. 2023, 14, 616–630, doi:10.3762/bjnano.14.51

Graphical Abstract
  • exclude the possibility that these defects are located on the TiO2 surface and that the concentration of defects is below the detection limit of XPS [52][53]. Another explanation would be this: The surface depth sensitivity of XPS is known to be 5–10 nm compared to 1 μm in PL. Hence, this technique
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Published 22 May 2023

Observation of multiple bulk bound states in the continuum modes in a photonic crystal cavity

  • Rui Chen,
  • Yi Zheng,
  • Xingyu Huang,
  • Qiaoling Lin,
  • Chaochao Ye,
  • Meng Xiong,
  • Martijn Wubs,
  • Yungui Ma,
  • Minhao Pu and
  • Sanshui Xiao

Beilstein J. Nanotechnol. 2023, 14, 544–551, doi:10.3762/bjnano.14.45

Graphical Abstract
  • be obtained. A 20× objective was used in the measurement. Limited by the excitation efficiencies of one specific position for all modes and the sensitivity of the spectrometer, the weak scattering signal from the resonances is inundated by noise. To identify the resonance wavelength of the cavity, a
  • high-order modes were also qualitatively analyzed. It is noteworthy that theoretically all modes can be excited if the overlap of the mode profile and the illumination spot is not zero. In our measurement, limited by the sensitivity of the setup, only the resonance with the highest excitation
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Published 27 Apr 2023

Carbon nanotube-cellulose ink for rapid solvent identification

  • Tiago Amarante,
  • Thiago H. R. Cunha,
  • Claudio Laudares,
  • Ana P. M. Barboza,
  • Ana Carolina dos Santos,
  • Cíntia L. Pereira,
  • Vinicius Ornelas,
  • Bernardo R. A. Neves,
  • André S. Ferlauto and
  • Rodrigo G. Lacerda

Beilstein J. Nanotechnol. 2023, 14, 535–543, doi:10.3762/bjnano.14.44

Graphical Abstract
  • , while the current was monitored until complete evaporation of the liquid. The device temperature was kept just below the boiling point of the liquid under evaluation. Afterward, the current was used to calculate the resistance, R0 (see Figure 1c), and the sensitivity gain (S), defined as S = ((R – R0
  • individual sensor. The parameters analyzed by PCA were “max”, “t_max”, “slope”, and “ratio_maxmin” (defined in Supporting Information File 1 as the input features). Figure 2a and Figure 2b depict, respectively, the sensitivity gain S (for pure water, and 10 and 100 ppm of glycerin in water) and the PCA
  • reproducible. The glycerin/water experiment shows sensitivity to detect oil compounds down to the parts-per-million range. Also, we demonstrate the important role of dielectric constant and vapor pressure in the transduction mechanism of the MFC/MWCNTs composite. We believe that our sensor can overcome the
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Published 26 Apr 2023

On the use of Raman spectroscopy to characterize mass-produced graphene nanoplatelets

  • Keith R. Paton,
  • Konstantinos Despotelis,
  • Naresh Kumar,
  • Piers Turner and
  • Andrew J. Pollard

Beilstein J. Nanotechnol. 2023, 14, 509–521, doi:10.3762/bjnano.14.42

Graphical Abstract
  • , it is not clear if Raman spectroscopy has the sensitivity to detect the presence of this material in the final product. In this paper, we examine the effect that increasing amounts of unexfoliated graphitic material in a well-defined sample of GNPs have on the measured Raman spectra. First, a sample
  • measuring bulk, reaggregated flakes, the 2D peak retains a symmetric shape, even to values of mean thickness where a single flake of equivalent thickness would yield a clear shoulder in the Raman spectrum [13]. It is clear from these measurements that this method also does not have the sensitivity to
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Published 24 Apr 2023

A mid-infrared focusing grating coupler with a single circular arc element based on germanium on silicon

  • Xiaojun Zhu,
  • Shuai Li,
  • Ang Sun,
  • Yongquan Pan,
  • Wen Liu,
  • Yue Wu,
  • Guoan Zhang and
  • Yuechun Shi

Beilstein J. Nanotechnol. 2023, 14, 478–484, doi:10.3762/bjnano.14.38

Graphical Abstract
  • knowledge, it is the highest coupling efficiency in a full-etch grating coupler based on Ge-on-Si. Moreover, the proposed grating coupler can be used for refractive index (RI) sensing, and the maximum sensitivity is 980.7 nm/RIU when the RI changes from 1 to 1.04. By comparing with traditional grating
  • geometry of the CAE. To the best of our knowledge, it is the highest coupling efficiency in full-etch grating couplers based on Ge-on-Si. Moreover, the proposed MIR FGC can also be used for sensing, and the maximum refractive index (RI) sensitivity is 980.7 nm/RIU. Compared with the suspended membrane Ge
  • 6877.8 nm to 6917.1 nm. The RI sensitivity is 980.7 nm/RIU obtained from a linear fit of the peak wavelength and RI, as shown in Figure 6b. The sensitivity is twice as large as that in [20]. Furthermore, the proposed sensor is a full-etch structure based on Ge-on-Si, which can be achieved by a single
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Published 06 Apr 2023

Quercetin- and caffeic acid-functionalized chitosan-capped colloidal silver nanoparticles: one-pot synthesis, characterization, and anticancer and antibacterial activities

  • Akif Hakan Kurt,
  • Elif Berna Olutas,
  • Fatma Avcioglu,
  • Hamza Karakuş,
  • Mehmet Ali Sungur,
  • Cansu Kara Oztabag and
  • Muhammet Yıldırım

Beilstein J. Nanotechnol. 2023, 14, 362–376, doi:10.3762/bjnano.14.31

Graphical Abstract
  • and their viability, as it greatly simplifies the procedure for measuring proliferation over MTT, reduces assay time, and increases the sensitivity of the assay [73]. In this study, the dose-dependent cell viabilities of human brain glioblastoma (U-118 MG) and human retinal pigment epithelium (ARPE-19
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Published 20 Mar 2023

Recent progress in cancer cell membrane-based nanoparticles for biomedical applications

  • Qixiong Lin,
  • Yueyou Peng,
  • Yanyan Wen,
  • Xiaoqiong Li,
  • Donglian Du,
  • Weibin Dai,
  • Wei Tian and
  • Yanfeng Meng

Beilstein J. Nanotechnol. 2023, 14, 262–279, doi:10.3762/bjnano.14.24

Graphical Abstract
  • nanoparticles exhibit various effects (e.g., homotypic targeting, prolonging drug circulation, regulating the immune system, and penetrating biological barriers) after encapsulation by cancer cell membranes. The sensitivity and specificity of diagnostic methods will also be improved by utilizing the properties
  • insufficient sensitivity of tumor tissue and serious side effects [91]. Thus, exploring more efficient radiosensitizers is a feasible way to improve the efficacy of radiotherapy. By improving the biocompatibility and tumor targeting ability of radiosensitizers, the concentration of radiosensitizers can be
  • anticancer effects [76]. After QT was delivered to tumor tissue by the active targeting ability of the membrane, the sensitivity to radiotherapy was effectively improved, and a strong anticancer effect was exerted under X-ray irradiation [76]. Gong et al. designed a pH-responsive multifunctional biomimetic
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Published 27 Feb 2023

Nanotechnology – a robust tool for fighting the challenges of drug resistance in non-small cell lung cancer

  • Filip Gorachinov,
  • Fatima Mraiche,
  • Diala Alhaj Moustafa,
  • Ola Hishari,
  • Yomna Ismail,
  • Jensa Joseph,
  • Maja Simonoska Crcarevska,
  • Marija Glavas Dodov,
  • Nikola Geskovski and
  • Katerina Goracinova

Beilstein J. Nanotechnol. 2023, 14, 240–261, doi:10.3762/bjnano.14.23

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  • effect of gefitinib and siRNA may be regarded as proof of restored sensitivity of EGFR-positive NSCLC to gefitinib as a result of silencing the expression of resistance-related genes [71]. Therapy consisting of EGFR siRNA combined with EGFR TKIs and anti-EGFR monoclonal antibodies can additively enhance
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Published 22 Feb 2023

High–low Kelvin probe force spectroscopy for measuring the interface state density

  • Ryo Izumi,
  • Masato Miyazaki,
  • Yan Jun Li and
  • Yasuhiro Sugawara

Beilstein J. Nanotechnol. 2023, 14, 175–189, doi:10.3762/bjnano.14.18

Graphical Abstract
  • advantages, namely high sensitivity to the electrostatic force gradient, high detection sensitivity using a cantilever with a weak spring constant at the first resonance, ease of implementation in adding FM-AFM, and no need to enhance the bandwidth of the cantilever deflection sensor. FM-KPFM is used to
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Published 31 Jan 2023

Intermodal coupling spectroscopy of mechanical modes in microcantilevers

  • Ioan Ignat,
  • Bernhard Schuster,
  • Jonas Hafner,
  • MinHee Kwon,
  • Daniel Platz and
  • Ulrich Schmid

Beilstein J. Nanotechnol. 2023, 14, 123–132, doi:10.3762/bjnano.14.13

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  • of nanotechnology. Fundamental research in atomic interactions, molecular reactions, and biological cell behaviour are key focal points, demanding a continuous increase in resolution and sensitivity. While renowned fields such as optomechanics have marched towards outstanding signal-to-noise ratios
  • the topographical features [1][2][3][4][5][6]. There is, however, room for improvement in cutting-edge AFM experiments, as the standard quantum limit in sensitivity, represented by a minimum between detection noise and backaction noise, has not been reached [7][8]. Beyond this limit, techniques exist
  • coherent bimodal drive to amplify the signal of the fundamental mode. Both increase the signal-to-noise ratio of the measurement, creating opportunity for either improved sensitivity or increased speed. Furthermore, sideband cooling has a secondary use in ultrahigh-vacuum AFM as a tool for controlling the
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Published 19 Jan 2023

Characterisation of a micrometer-scale active plasmonic element by means of complementary computational and experimental methods

  • Ciarán Barron,
  • Giulia Di Fazio,
  • Samuel Kenny,
  • Silas O’Toole,
  • Robin O’Reilly and
  • Dominic Zerulla

Beilstein J. Nanotechnol. 2023, 14, 110–122, doi:10.3762/bjnano.14.12

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  • . Because of this extreme sensitivity, small changes in the local temperature, and hence in optical constants, will result in subtle but appreciable changes of reflectivity in the SPR curve. Homodyne detection, with the modulated electric currents as reference, enables a detailed examination of the
  • moved to remove the silver. The investigations carried out consist of two experimental correlative methods. The first method is the above discussed enhanced SPR experiment, based on an ATR setup whose sensitivity is enhanced through the addition of a lock-in amplifier. The second method probes the
  • . The reference phase of the LIA was chosen to maximise X. The LIA was set to a time constant of τ = 300 ms, with second-order low-pass filtering and a sensitivity of 30 mV to avoid spurious input overloads. Once this set was recorded, the stage was moved 1 × 10−2 degrees to the next angular position in
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Published 16 Jan 2023

Antimicrobial and mechanical properties of functionalized textile by nanoarchitectured photoinduced Ag@polymer coating

  • Jessica Plé,
  • Marine Dabert,
  • Helene Lecoq,
  • Sophie Hellé,
  • Lydie Ploux and
  • Lavinia Balan

Beilstein J. Nanotechnol. 2023, 14, 95–109, doi:10.3762/bjnano.14.11

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  • lower than the maximum effective dose is not linear, unlike that of E. coli bacteria, confirming a higher sensitivity to silver, even in the presence of low amounts of released silver (90% inhibition rate for approximately 2.5 µg/g released silver). This effect, more pronounced for C. albicans than E
  • . coli has also been observed by Akinsiku et al. [56], who determined that the sensitivity to silver varies by a factor of 5 between clinical isolates of E. coli and C. albicans. The mechanisms leading to this difference do not seem to have been elucidated so far. However, some hypotheses can be put
  • process of the cell [59]. Moreover, C. albicans has been reported as particularly sensitive to ROS, which may be one of the reasons for its higher sensitivity to silver than other microorganisms [60]. The culture medium could also impact microorganism susceptibility to silver ions. For comparison purposes
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Published 12 Jan 2023

Structural studies and selected physical investigations of LiCoO2 obtained by combustion synthesis

  • Monika Michalska,
  • Paweł Ławniczak,
  • Tomasz Strachowski,
  • Adam Ostrowski and
  • Waldemar Bednarski

Beilstein J. Nanotechnol. 2022, 13, 1473–1482, doi:10.3762/bjnano.13.121

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  • resonance (EPR) experiments were performed using an X-band ELEXSYS E500 (Bruker, Germany) spectrometer. The samples were placed in a Super High Sensitivity Probehead (Bruker, Germany) cavity and in a cryostat where the temperature was determined and stabilized using an Oxford temperature controller ITC503S
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Published 07 Dec 2022

Rapid and sensitive detection of box turtles using an electrochemical DNA biosensor based on a gold/graphene nanocomposite

  • Abu Hashem,
  • M. A. Motalib Hossain,
  • Ab Rahman Marlinda,
  • Mohammad Al Mamun,
  • Khanom Simarani and
  • Mohd Rafie Johan

Beilstein J. Nanotechnol. 2022, 13, 1458–1472, doi:10.3762/bjnano.13.120

Graphical Abstract
  • the applications of impedance DNA hybridisation biosensors for the detection of a number of analytes [31][32][33][34]. Nanomaterials may significantly enhance biosensor performance, stability, repeatability, and sensitivity [35][36][37][38][39]. Among various nanomaterials, graphene (Gr) [40] and gold
  • sensitivity of a nanosensor. Mitochondrial DNA (mtDNA) has numerous advantages over nuclear genomes, including increased quantity and copy number in each cell, which may be used to differentiate intra- and interspecies [49][50]. In this study, we identified and selected a unique DNA sequence in BT by
  • it shows a significant sensitivity when modified with the AuNPs/Gr nanocomposite, which is also corroborated by CV and DPV results. These findings imply that electrode modification with AuNPs/Gr enhances electrocatalytic activity. Many researchers have reported a similar shape of the Nyquist plot
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Published 06 Dec 2022

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

  • Chaoying Shi,
  • Jinhua Hu,
  • Xiuhong Liu,
  • Junfang Liang,
  • Jijun Zhao,
  • Haiyan Han and
  • Qiaofen Zhu

Beilstein J. Nanotechnol. 2022, 13, 1408–1417, doi:10.3762/bjnano.13.116

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  • achieved with the highest sensitivity of 453 nm/RIU and a maximum figure of merit (FOM) of 9808. Such dual-band high-Q resonator is expected to have promising applications in multi-wavelength sensing and nonlinear optics. Keywords: bound states in the continuum; dual band; high quality factor; localized
  • index of the surrounding medium. In this section, we will investigate the sensing performance of the proposed structure through the variation of two key structural parameters (α and h). Besides the Q-factor, the sensitivity (S) and FOM are also two important parameters for a refractive index sensor
  • , which are defined as the ratio of the resonant wavelength drift to the change in refractive index of the surrounding environment (S = Δλres/Δnc) and the ratio of sensitivity to the FWHM (FOM = S/FWHM), respectively [55]. Taking the structural parameters previously mentioned as an example, the proposed
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Published 25 Nov 2022

Studies of probe tip materials by atomic force microscopy: a review

  • Ke Xu and
  • Yuzhe Liu

Beilstein J. Nanotechnol. 2022, 13, 1256–1267, doi:10.3762/bjnano.13.104

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  • and disadvantages of the improved probes compared with ordinary probes by comparing the differences in spatial resolution, sensitivity, imaging, and other performance aspects, and finally provides an outlook on the future development of AFM probes. This paper promotes the development of AFM probes in
  • disadvantages of the improved probes compared with ordinary probes by comparing the differences in performance in terms of spatial resolution, sensitivity, and imaging, and finally provides an outlook on the future development of AFM probes. Review Metal probe Metal nanocluster probe Metal nanoclusters contain
  • addition, the method was also used for the determination of glyphosate in tap water samples with good recovery results. The assay has the advantages of high sensitivity and good selectivity. Compared to the above-proposed metal nanoclusters, gold-based bimetallic nanoclusters have the advantages of metal
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Published 03 Nov 2022

A super-oscillatory step-zoom metalens for visible light

  • Yi Zhou,
  • Chao Yan,
  • Peng Tian,
  • Zhu Li,
  • Yu He,
  • Bin Fan,
  • Zhiyong Wang,
  • Yao Deng and
  • Dongliang Tang

Beilstein J. Nanotechnol. 2022, 13, 1220–1227, doi:10.3762/bjnano.13.101

Graphical Abstract
  • designed super-oscillatory spots [9][10]. Nevertheless, the low efficiency may be tolerable for some specific applications, such as observing target objects with high illumination intensity in microscopic systems. High-sensitivity detectors and long exposure time would be also advantageous. Conclusion In
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Published 28 Oct 2022

Design of surface nanostructures for chirality sensing based on quartz crystal microbalance

  • Yinglin Ma,
  • Xiangyun Xiao and
  • Qingmin Ji

Beilstein J. Nanotechnol. 2022, 13, 1201–1219, doi:10.3762/bjnano.13.100

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  • for various sensing applications, including chirality detection due to the high sensitivity to nanogram or picogram mass changes, fast response, real-time detection, easy operation, suitability in different media, and low experimental cost. The sensing performance of QCM is dependent on the surface
  • sensors [17][18][19]. However, these methods still have drawbacks as they are time consuming, expensive, and unable to monitor real-time detection. In addition, they have low-recognition efficiency and low sensitivity to weak signals. Therefore, researchers keep devoting their efforts to developing novel
  • (e.g., DNA analysis, microorganism assays, nucleic acid detection, pharmaceutical substance detection, and gas monitoring) and also a powerful tool for chiral recognition [23][24][25]. The sensitivity and specificity of QCM-based chiral sensors largely depend on the recognition layers on the surface of
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Published 27 Oct 2022
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