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Search for "selectivity" in Full Text gives 283 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Comparison of four methods for the biofunctionalization of gold nanorods by the introduction of sulfhydryl groups to antibodies

  • Xuefeng Wang,
  • Zhong Mei,
  • Yanyan Wang and
  • Liang Tang

Beilstein J. Nanotechnol. 2017, 8, 372–380, doi:10.3762/bjnano.8.39

Graphical Abstract
  • , myoglobin, and cardiac troponin I, indicating that these biochips also have high selectivity to ensure specific target detection. Conclusion Direct binding of modified antibodies to GNRs is an attractive process because of its numerous advantages, such as the simplification of the functionalization
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Published 06 Feb 2017

Colorimetric gas detection by the varying thickness of a thin film of ultrasmall PTSA-coated TiO2 nanoparticles on a Si substrate

  • Urmas Joost,
  • Andris Šutka,
  • Meeri Visnapuu,
  • Aile Tamm,
  • Meeri Lembinen,
  • Mikk Antsov,
  • Kathriin Utt,
  • Krisjanis Smits,
  • Ergo Nõmmiste and
  • Vambola Kisand

Beilstein J. Nanotechnol. 2017, 8, 229–236, doi:10.3762/bjnano.8.25

Graphical Abstract
  • thickness and the apparent color of the functional TiO2 NP thin films is rapid, and also changes reversibly within seconds of exposure. The sensor exhibits a gradual color change from yellow to green/blue upon exposure, and also a selectivity to different VOCs with the highest response (i.e., the largest
  • from 1.87 to 1.81, i.e., also 3% measured at 633 nm. A decrease of the refractive index during swelling is understandable, taking into account the refractive index of ethanol (1.36 at 633 nm). The selectivity to different gases can be achieved by surface functionalization of the nanoparticles, which
  • was previously utilized both in localized surface plasmon resonance (LSPR) devices and porous Bragg stacks [17]. As mentioned before, the NPs in our samples are covered with PTSA. This functional coating ensures selectivity and different responses to different VOCs. Figure 6 shows that the proposed NP
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Published 24 Jan 2017

Sensitive detection of hydrocarbon gases using electrochemically Pd-modified ZnO chemiresistors

  • Elena Dilonardo,
  • Michele Penza,
  • Marco Alvisi,
  • Gennaro Cassano,
  • Cinzia Di Franco,
  • Francesco Palmisano,
  • Luisa Torsi and
  • Nicola Cioffi

Beilstein J. Nanotechnol. 2017, 8, 82–90, doi:10.3762/bjnano.8.9

Graphical Abstract
  • various HC gas concentrations in the range of 30–1000 ppm. The Pd-modified ZnO NRs showed a higher selectivity and sensitivity compared to pristine ZnO NRs. The mean sensitivity of Pd-modified ZnO NRs towards the analyzed HCs gases increased with the length of the hydrocarbon chain of the target gas
  • molecule. Finally, the evaluation of the selectivity revealed that the presence or the absence of metal nanoparticles on ZnO NRs improves the selectivity in the detection of specific HCs gaseous molecules. Keywords: chemiresistive gas sensor; electrosynthesis; hydrocarbon gas sensor; Pd-modified ZnO; ZnO
  • detection were developed [27][28][29][30][31][32][33][34][35][36][37]. Among MOx semiconductors, nanostructured ZnO is promising as sensing material in chemiresistive gas sensors, although its use still reveals some drawbacks related to its low selectivity, long response and recovery times, high power
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Published 10 Jan 2017

Nanostructured SnO2–ZnO composite gas sensors for selective detection of carbon monoxide

  • Paul Chesler,
  • Cristian Hornoiu,
  • Susana Mihaiu,
  • Cristina Vladut,
  • Jose Maria Calderon Moreno,
  • Mihai Anastasescu,
  • Carmen Moldovan,
  • Bogdan Firtat,
  • Costin Brasoveanu,
  • George Muscalu,
  • Ion Stan and
  • Mariuca Gartner

Beilstein J. Nanotechnol. 2016, 7, 2045–2056, doi:10.3762/bjnano.7.195

Graphical Abstract
  • gases is the major drawback when using this type of material, meaning that these sensors are nonselective towards a specific gas. False positives are often generated in this way. Gas selectivity can be achieved using different “sensor tuning” techniques. These include controlling the sensing temperature
  • the sol–gel/dip coating method. The sensor cross-response was tested with other hazardous gases, namely methane (CH4), carbon dioxide (CO2) and propane (C3H8); good selectivity was found towards CO over CH4, C3H8 and CO2, so the sensor may be proposed for further development towards indoor
  • be clearly observed that the optimum working temperature for the S2 sensor is 210 °C, and the sensor response at other working temperatures is lower. The second best sensor in terms of CO response is pristine SnO2 (S5), but later in this paper, it will be shown that its selectivity towards CO is low
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Published 22 Dec 2016

A novel electrochemical nanobiosensor for the ultrasensitive and specific detection of femtomolar-level gastric cancer biomarker miRNA-106a

  • Maryam Daneshpour,
  • Kobra Omidfar and
  • Hossein Ghanbarian

Beilstein J. Nanotechnol. 2016, 7, 2023–2036, doi:10.3762/bjnano.7.193

Graphical Abstract
  • relationship with the concentration of the target miRNA ranging from 1 × 10−3 pM to 1 × 103 pM, and the detection limit was 3 × 10−4 pM. The proposed miRNA-nanobiosensor showed remarkable selectivity, high specificity, agreeable storage stability, and great performance in real sample investigation with no
  • biosensing analysis. In addition, the selectivity of this nanobiosensor for miR-106a detection was evaluated and compared in presence and absence of three non-complementary miRNAs as interfering sequences. As Figure 5 shows, under the same conditions DPV responses generated from non-complementary miRNAs via
  • agreement. It is worth noting that commonly used miRNA determination techniques such as northern blot and qRT-PCR provide a significantly low detection limit (aM-nM) and excellent selectivity [21]. However, their complex time-consuming procedure along with the need for amplification steps has made them
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Published 19 Dec 2016

A dioxaborine cyanine dye as a photoluminescence probe for sensing carbon nanotubes

  • Mohammed Al Araimi,
  • Petro Lutsyk,
  • Anatoly Verbitsky,
  • Yuri Piryatinski,
  • Mykola Shandura and
  • Aleksey Rozhin

Beilstein J. Nanotechnol. 2016, 7, 1991–1999, doi:10.3762/bjnano.7.190

Graphical Abstract
  • in Table 1. The variations of redshifts for different SWNT chiralities can be explained by a structural matching of the π-electron systems of SWNTs with particular chirality and the developed π-electron system of DOB-719. The different redshifts provide not only sensitivity, but also selectivity of
  • SWNT opens a new way to design efficient and tailorable optical probes for not only sensitivity, but also selectivity of the PL detection towards the nanotube diameters. Experimental Sample preparation Synthesis DOB-719 DOB-719 was synthesised as shown in Scheme 1 by the reaction of (2 mmol
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Published 14 Dec 2016

Layered composites of PEDOT/PSS/nanoparticles and PEDOT/PSS/phthalocyanines as electron mediators for sensors and biosensors

  • Celia García-Hernández,
  • Cristina García-Cabezón,
  • Fernando Martín-Pedrosa,
  • José Antonio De Saja and
  • María Luz Rodríguez-Méndez

Beilstein J. Nanotechnol. 2016, 7, 1948–1959, doi:10.3762/bjnano.7.186

Graphical Abstract
  • character which is an intrinsic semiconductor) [9][16][17][18]. On the other hand, enzymatic electrochemical biosensors based on phenol oxidases are a good alternative to analyze phenols due to their high sensitivity and selectivity. Tyrosinase oxidizes monophenols and o-diphenols to the corresponding
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Published 08 Dec 2016

Cubic chemically ordered FeRh and FeCo nanomagnets prepared by mass-selected low-energy cluster-beam deposition: a comparative study

  • Veronique Dupuis,
  • Anthony Robert,
  • Arnaud Hillion,
  • Ghassan Khadra,
  • Nils Blanc,
  • Damien Le Roy,
  • Florent Tournus,
  • Clement Albin,
  • Olivier Boisron and
  • Alexandre Tamion

Beilstein J. Nanotechnol. 2016, 7, 1850–1860, doi:10.3762/bjnano.7.177

Graphical Abstract
  • using synchrotron radiation techniques, allowing for chemical selectivity and high photon flux. Indeed, for X-ray diffraction, the atomic scattering factor f is a complex number and can be written as follows: f = f0+ f′(λ) + if″(λ), where f0 ~ Z while f′ and f″ are wavelength-dependent especially around
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Published 28 Nov 2016

Monolayer graphene/SiC Schottky barrier diodes with improved barrier height uniformity as a sensing platform for the detection of heavy metals

  • Ivan Shtepliuk,
  • Jens Eriksson,
  • Volodymyr Khranovskyy,
  • Tihomir Iakimov,
  • Anita Lloyd Spetz and
  • Rositsa Yakimova

Beilstein J. Nanotechnol. 2016, 7, 1800–1814, doi:10.3762/bjnano.7.173

Graphical Abstract
  • the graphene/SiC-based sensor has been proposed as an indicator of presence of the heavy metals. Since the calculations suggested the strongest charge transfer between Pb and graphene, the proposed sensing platform was characterized by good selectivity towards lead atoms and slight interferences from
  • draw conclusions about the selectivity of the graphene-based sensors towards different heavy metals. DFT analysis and computational details An important step is to study the interaction between heavy metals and the graphene surface by DFT calculations. Furthermore, in order to establish the most
  • stabilization after adding heavy metals, changed depending on the type of heavy metals. A histogram of the sensitivity of the graphene/SiC structure to different heavy metals is presented in Figure 10. One can see that the selectivity of the graphene/SiC toward Pb atoms is expected to be the highest compared to
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Published 22 Nov 2016

Surface-enhanced infrared absorption studies towards a new optical biosensor

  • Lothar Leidner,
  • Julia Stäb,
  • Jennifer T. Adam and
  • Günter Gauglitz

Beilstein J. Nanotechnol. 2016, 7, 1736–1742, doi:10.3762/bjnano.7.166

Graphical Abstract
  • updated in [4]. Besides sensitivity, stability, and reversibility, selectivity is a vital requirement of a biosensor, which is the main issue of direct optical method: it is not selective as a matter of principle. Optical sensors monitor the interaction of electromagnetic radiation with matter. In many
  • optical sensors, if not most cases, a change of the refractive index is observed. In order to be selective to the analyte, but insensitive to unspecific binding, the sensor surface is covered by a biolayer which must guarantee both selectivity and sensitivity for the analyte under consideration. There are
  • (and gives a positive answer of course): “Do we need to advance into the MIR spectral regime given the maturity of optoelectronics and photonics in the VIS and NIR?” The main reasons to research sensors that operate in the mid-infrared are the inherent molecular selectivity (“fingerprint spectra
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Published 16 Nov 2016

Nanostructured TiO2-based gas sensors with enhanced sensitivity to reducing gases

  • Wojciech Maziarz,
  • Anna Kusior and
  • Anita Trenczek-Zajac

Beilstein J. Nanotechnol. 2016, 7, 1718–1726, doi:10.3762/bjnano.7.164

Graphical Abstract
  • selectivity to CO(CH3)2 after sensitization by SnO2 nanoparticles. The sensor response time was of the order of several seconds. Their fast response, high sensitivity to selected gas species, improved selectivity and stability suggest that the SnO2-decorated flower-like 3D nanostructures are a promising
  • material for application as an acetone sensor. Keywords: acetone; flower-like 3D nanostructures; gas sensors; selectivity; titanium dioxide; Introduction The market for resistive-type gas sensors is dominated by materials developed on the base of thin or thick layers composed of polycrystalline metal
  • to display better gas selectivity and sensitivity [1][2]. Additionally, open nanostructures facilitate the penetration of gas, and as a consequence, reduces the response time. Titanium dioxide (TiO2) is effectively used in environmental and energy production applications such as dye-sensitized solar
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Published 15 Nov 2016

Hydrophilic silver nanoparticles with tunable optical properties: application for the detection of heavy metals in water

  • Paolo Prosposito,
  • Federico Mochi,
  • Erica Ciotta,
  • Mauro Casalboni,
  • Fabio De Matteis,
  • Iole Venditti,
  • Laura Fontana,
  • Giovanna Testa and
  • Ilaria Fratoddi

Beilstein J. Nanotechnol. 2016, 7, 1654–1661, doi:10.3762/bjnano.7.157

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  • ][20][21][22]. The presence of specific functionality on the particle surface can increase the adsorption of the analytes, resulting in an enhancement of sensitivity or selectivity. An interesting application of functionalized AgNPs is reported by Contino et al. [33] where synthesized AgNPs were capped
  • solution demonstrated a spectral response to the presence of metal ions. This showed a sensitivity and selectivity to Ni2+ ions with a sensitivity as low as 0.3 ppm. A quantitative determination of these species in the concentration range of 0.3–1.0 ppm was provided. This approach seems very promising for
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Published 09 Nov 2016

Graphene-enhanced plasmonic nanohole arrays for environmental sensing in aqueous samples

  • Christa Genslein,
  • Peter Hausler,
  • Eva-Maria Kirchner,
  • Rudolf Bierl,
  • Antje J. Baeumner and
  • Thomas Hirsch

Beilstein J. Nanotechnol. 2016, 7, 1564–1573, doi:10.3762/bjnano.7.150

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  • detection of even small molecules at low concentrations. Nevertheless, selectivity still needs to be improved. Specific receptors can be attached to the carbon nanomaterial or selective filters based on molecular imprinted polymer films can be applied. The combination of several semi-specific sensors to an
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Published 01 Nov 2016

Antitumor magnetic hyperthermia induced by RGD-functionalized Fe3O4 nanoparticles, in an experimental model of colorectal liver metastases

  • Oihane K. Arriortua,
  • Eneko Garaio,
  • Borja Herrero de la Parte,
  • Maite Insausti,
  • Luis Lezama,
  • Fernando Plazaola,
  • Jose Angel García,
  • Jesús M. Aizpurua,
  • Maialen Sagartzazu,
  • Mireia Irazola,
  • Nestor Etxebarria,
  • Ignacio García-Alonso,
  • Alberto Saiz-López and
  • José Javier Echevarria-Uraga

Beilstein J. Nanotechnol. 2016, 7, 1532–1542, doi:10.3762/bjnano.7.147

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  • cells, being bound the RGD peptides by “click chemistry” due to its selectivity and applicability. The thermal decomposition of iron metallo-organic precursors yield homogeneous Fe3O4 nanoparticles that have been properly functionalized with RGD peptides, and the preparation of magnetic fluids has been
  • an improvement in the selectivity of the reaction [31]. In this paper, a successive addition synthesis by a thermal decomposition method has been employed to obtain oleic acid and oleylamine-capped magnetite nanoparticles with defined sizes [32][33][34]. Nevertheless, these high quality, organic
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Published 28 Oct 2016

Enhanced detection of nitrogen dioxide via combined heating and pulsed UV operation of indium oxide nano-octahedra

  • Oriol Gonzalez,
  • Sergio Roso,
  • Xavier Vilanova and
  • Eduard Llobet

Beilstein J. Nanotechnol. 2016, 7, 1507–1518, doi:10.3762/bjnano.7.144

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  • limiting the implementation of widely distributed, smart wireless sensor systems that can be deployed and then remain in operation with no further human intervention. Overcoming these barriers entails developing gas sensors featuring low cost, small size, enhanced sensitivity, selectivity, stability and
  • air [9][10][11][12]. However, the facts that metal oxides are known for their lack of selectivity and this, combined with their normally high operating temperatures, have prevented their integration as gas sensitive material in the tags of RFID sensing systems. However, there have been reports of gas
  • has been explored for improving sensitivity and selectivity of metal oxides [17]. In this paper the use of heating and pulsed UV irradiation is investigated in view of enhancing the sensitivity and lowering power consumption of a resistive, nitrogen dioxide sensor that employs semiconducting indium
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Published 25 Oct 2016

False positives and false negatives measure less than 0.001% in labeling ssDNA with osmium tetroxide 2,2’-bipyridine

  • Anastassia Kanavarioti

Beilstein J. Nanotechnol. 2016, 7, 1434–1446, doi:10.3762/bjnano.7.135

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  • standing, (iii) superior selectivity for T over C by a factor of 27, (iv) undetectable degradation of the DNA strand under the labeling conditions, and (v) undetectable reactivity towards the purines (false positives). Most importantly OsBp reactivity towards T or C was found to be independent of
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Published 12 Oct 2016

A composite structure based on reduced graphene oxide and metal oxide nanomaterials for chemical sensors

  • Vardan Galstyan,
  • Elisabetta Comini,
  • Iskandar Kholmanov,
  • Andrea Ponzoni,
  • Veronica Sberveglieri,
  • Nicola Poli,
  • Guido Faglia and
  • Giorgio Sberveglieri

Beilstein J. Nanotechnol. 2016, 7, 1421–1427, doi:10.3762/bjnano.7.133

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  • , sensitivity and selectivity) with respect to the application of ZnO nanomaterials in chemical gas sensors that need to be overcome [7][14]. Hybrid structures composed of two or more different materials with diverse functional properties are of great interest to develop advanced composite materials for
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Published 10 Oct 2016

Ammonia gas sensors based on In2O3/PANI hetero-nanofibers operating at room temperature

  • Qingxin Nie,
  • Zengyuan Pang,
  • Hangyi Lu,
  • Yibing Cai and
  • Qufu Wei

Beilstein J. Nanotechnol. 2016, 7, 1312–1321, doi:10.3762/bjnano.7.122

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  • PANI influences the sensing performance of the In2O3/PANI composite nanofibers. In this paper, In2O3/PANI composite nanofibers with a mass ratio of 1:2 exhibited the highest response values, excellent selectivity, good repeatability and reversibility. Keywords: ammonia (NH3); electrospinning; gas
  • even death [5][6][7]. So, there is an urgent need to develop a kind of gas sensor with high sensitivity and selectivity to detect NH3 at room temperature. Metal oxide semiconductors can be applied as sensing materials for monitoring NH3. Ammonia sensors based on In2O3 [8], TiO2 [9], SnO2 [10], ZnO [11
  • selectivity of In2O3/PANI-2 nanofibers sensor. Figure 8 shows the dynamic response of In2O3/PANI-2 nanofibers sensor to methanol, ethanol, acetone and ammonia at a concentration of 1000 ppm. It is obvious that the In2O3/PANI-2 nanofibers sensor was almost insensitive to methanol, ethanol and acetone vapors
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Published 19 Sep 2016

Voltammetric determination of polyphenolic content in pomegranate juice using a poly(gallic acid)/multiwalled carbon nanotube modified electrode

  • Refat Abdel-Hamid and
  • Emad F. Newair

Beilstein J. Nanotechnol. 2016, 7, 1104–1112, doi:10.3762/bjnano.7.103

Graphical Abstract
  • concentration throughout the range of 4.97 × 10−6 to 3.38 × 10−5 M with a detection limit of 3.22 × 10−6 M (S/N = 3). The fabricated sensor shows good selectivity, stability, repeatability and (101%) recovery. The sensor was successfully utilized for the determination of total phenolic content in fresh
  • modified with a multiwalled carbon nanotube/o-dianisidine derivative [11] and a molecularly imprinted polypyrrole polymer-based film [12] were used for gallic acid analysis with high selectivity. A bimediator amperometric sensor for gallic acid was fabricated by surface modification of a graphite electrode
  • elimination of the extraction and preconcentration steps of the analyte necessary for chromatographic techniques. Furthermore, the present accumulation time is shorter than the other methods with preconcentration time of 15 min, while in the present study the optimal accumulation time was 60 s. Selectivity
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Published 29 Jul 2016

Multiwalled carbon nanotube hybrids as MRI contrast agents

  • Nikodem Kuźnik and
  • Mateusz M. Tomczyk

Beilstein J. Nanotechnol. 2016, 7, 1086–1103, doi:10.3762/bjnano.7.102

Graphical Abstract
  • diagnosis. Despite the currently used gadolinium MRI CAs, administered to ca. 10 million patients each year worldwide [4], investigations have focused on this lanthanide metal in order to reduce the side effects and needed dose, but also to enhance the selectivity of desired organs and tissues as well as to
  • pristine MWCNT [27]. The reaction of p-azidophenol with MWCNT dispersion resulted in a hybrid containing 9% (w/w) of N–Ph–OH according to TGA. Since phenols exhibit a high affinity and selectivity for Fe3+ [28], we coordinated the iron ions to achieve an Fe content over 6% (m/m) in Fe-L4-MWCNT#Kuźnik
  • , e.g., stability of dispersion in buffers, lower cytotoxicity, visual contrast or selectivity for certain organs [33]. Finally, additional effects appear after introduction into a living organism, thus it is not surprising that further evolution of r2/r1 takes place there. It was found that the local
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Published 27 Jul 2016

Dielectrophoresis of gold nanoparticles conjugated to DNA origami structures

  • Anja Henning-Knechtel,
  • Matthew Wiens,
  • Mathias Lakatos,
  • Andreas Heerwig,
  • Frieder Ostermaier,
  • Nora Haufe and
  • Michael Mertig

Beilstein J. Nanotechnol. 2016, 7, 948–956, doi:10.3762/bjnano.7.87

Graphical Abstract
  • [15] or – with higher selectivity – by using dielectrophoresis (DEP) [16][17][18][19]. DEP is an electrokinetic phenomenon and results in a force that moves polarizable objects either towards regions with the highest (positive DEP (pDEP)) or lowest electrical field gradient (negative DEP). The
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Published 01 Jul 2016

Reconstitution of the membrane protein OmpF into biomimetic block copolymer–phospholipid hybrid membranes

  • Matthias Bieligmeyer,
  • Franjo Artukovic,
  • Stephan Nussberger,
  • Thomas Hirth,
  • Thomas Schiestel and
  • Michaela Müller

Beilstein J. Nanotechnol. 2016, 7, 881–892, doi:10.3762/bjnano.7.80

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  • lipid membranes with high fidelity and selectivity. In the field of biotechnology, they are particularly attractive for single-molecule DNA sequencing [1][2][3][4][5] and stochastic sensing of ions and macromolecules [6][7][8][9][10]. The well-defined dimensions of the protein pores furthermore offer a
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Published 21 Jun 2016

Understanding interferometry for micro-cantilever displacement detection

  • Alexander von Schmidsfeld,
  • Tobias Nörenberg,
  • Matthias Temmen and
  • Michael Reichling

Beilstein J. Nanotechnol. 2016, 7, 841–851, doi:10.3762/bjnano.7.76

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  • interferometer is characterized by the finesse , defined as the ratio between the spectral selectivity and the free spectral range [5]. Both types of interferometers are suitable for precisely detecting small movements of one of the involved mirrors [6]. The high precision and sensitivity of calibrated position
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Published 10 Jun 2016

Selective photocatalytic reduction of CO2 to methanol in CuO-loaded NaTaO3 nanocubes in isopropanol

  • Tianyu Xiang,
  • Feng Xin,
  • Jingshuai Chen,
  • Yuwen Wang,
  • Xiaohong Yin and
  • Xiao Shao

Beilstein J. Nanotechnol. 2016, 7, 776–783, doi:10.3762/bjnano.7.69

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  • reduce CO2 with water. H2 was introduced into this process as an electron donor. Ru/NaTaO3 was found to have the best activity (CH4 51.8 μmol/(g·h)) and product selectivity in converting CO2 to CH4. Junwang Tang and his team [17] prepared KTaO3 nanoflakes by a solvothermal method in a hexane–water
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Published 01 Jun 2016

Facile synthesis of water-soluble carbon nano-onions under alkaline conditions

  • Gaber Hashem Gaber Ahmed,
  • Rosana Badía Laíño,
  • Josefa Angela García Calzón and
  • Marta Elena Díaz García

Beilstein J. Nanotechnol. 2016, 7, 758–766, doi:10.3762/bjnano.7.67

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  • strongest quencher. In the case of C-dots (Figure 6b), Fe(III) was the main quencher and Hg(II) also quenched to a lesser extent. Consequently, the selectivity against metal ions of the C-onions seemed to be lower than that of C-dots. These results may be explained on the basis of the C-onions structure
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Published 27 May 2016
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