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Search for "absorption" in Full Text gives 986 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Combining physical vapor deposition structuration with dealloying for the creation of a highly efficient SERS platform

  • Adrien Chauvin,
  • Walter Puglisi,
  • Damien Thiry,
  • Cristina Satriano,
  • Rony Snyders and
  • Carla Bittencourt

Beilstein J. Nanotechnol. 2023, 14, 83–94, doi:10.3762/bjnano.14.10

Graphical Abstract
  • adsorption isotherm curve of RhB [49][50]. The plateau in the SERS response observed between 10−8 and 10−10 mol·L−1 can be assigned to either the saturation of the chemical sites (i.e., no supplementary absorption is made) or to the fact that RhB continued to be absorbed outside of the hot spot [6][51
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Published 11 Jan 2023

Frontiers of nanoelectronics: intrinsic Josephson effect and prospects of superconducting spintronics

  • Anatolie S. Sidorenko,
  • Horst Hahn and
  • Vladimir Krasnov

Beilstein J. Nanotechnol. 2023, 14, 79–82, doi:10.3762/bjnano.14.9

Graphical Abstract
  • frequency range, switching from the superconducting to the resistive state due to absorption of a 10 GHz external signal [19]. Achieving a large coherent gain of the receiver, up to a factor of three, of the emitted power from two simultaneously biased arrays of Josephson junctions compared to that of the
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Published 10 Jan 2023

Two-step single-reactor synthesis of oleic acid- or undecylenic acid-stabilized magnetic nanoparticles by thermal decomposition

  • Mykhailo Nahorniak,
  • Pamela Pasetto,
  • Jean-Marc Greneche,
  • Volodymyr Samaryk,
  • Sandy Auguste,
  • Anthony Rousseau,
  • Nataliya Nosova and
  • Serhii Varvarenko

Beilstein J. Nanotechnol. 2023, 14, 11–22, doi:10.3762/bjnano.14.2

Graphical Abstract
  • visible at 1577 and 1524 cm−1 and a band at 432 cm−1 corresponds to the vibrations of Fe–O or С–СН3 [29][30]. At the end of the first stage (SFin Stage1), the absorption bands corresponding to the acetylacetonate ligand or acetylacetone residues are not observed. The absorption band at 432 cm−1 also
  • SFin Stage1, Figure S2 and Figure S3 in Supporting Information File 1) formed due to the exchange reaction of acetylacetonate and a higher acid show several absorption bands which were absent in the spectra of reactants and 1-octadecene (Table 2). The low-intensity absorption band at 1741–1742 cm−1
  • , which appeared in the spectra of the reaction mixture of both oleate and undecylate complexes in octadecene, corresponds to vibrations of the carbonyl group of free unassociated acid. This band is not observed in the spectra of pure acids. The absorption band at 1711 cm−1 in both cases can be attributed
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Published 03 Jan 2023

Atmospheric water harvesting using functionalized carbon nanocones

  • Fernanda R. Leivas and
  • Marcia C. Barbosa

Beilstein J. Nanotechnol. 2023, 14, 1–10, doi:10.3762/bjnano.14.1

Graphical Abstract
  • different processes to develop AWH such as condensing and collecting moisture, cooling ambient air below its dew point [10][11], and using chemical and physical processes involving absorption and adsorption [9][12][13]. Many of these mechanisms are inspired by structures found in nature (biomimetic designs
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Published 02 Jan 2023

Electrical and optical enhancement of ITO/Mo bilayer thin films via laser annealing

  • Abdelbaki Hacini,
  • Ahmad Hadi Ali,
  • Nurul Nadia Adnan and
  • Nafarizal Nayan

Beilstein J. Nanotechnol. 2022, 13, 1589–1595, doi:10.3762/bjnano.13.133

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  • before and after laser annealing. The bandgap energy Eg was determined using the following equation (Tauc relation) [28]: where α is the absorption coefficient, hν is the photon energy; A is a constant, Eg is the bandgap energy, n = 0.5 for a direct bandgap, and n = 2 for an indirect bandgap. The bandgap
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Published 28 Dec 2022

Observation of collective excitation of surface plasmon resonances in large Josephson junction arrays

  • Roger Cattaneo,
  • Mikhail A. Galin and
  • Vladimir M. Krasnov

Beilstein J. Nanotechnol. 2022, 13, 1578–1588, doi:10.3762/bjnano.13.132

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  • suppression of Is corresponds to the absorbed MW power, Pa ≃ ≃ 30 nW. Thus, we can perform an absolute calibration of the absorbed power as a function of the detector resistance, as shown in Figure 6f. The absorbed power depends on the absorption efficiency, γ, the antenna area, Aa, and the power density
  • the source of approx. 100 μW, taking into account losses on the way to the detector via diffraction on optical windows and a set of low-temperature MW filters (Zitex). Such an estimation indicates that the absorption efficiency γ of our detector is indeed not far from the optimal. However, the overall
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Published 28 Dec 2022

Single-step extraction of small-diameter single-walled carbon nanotubes in the presence of riboflavin

  • Polina M. Kalachikova,
  • Anastasia E. Goldt,
  • Eldar M. Khabushev,
  • Timofei V. Eremin,
  • Timofei S. Zatsepin,
  • Elena D. Obraztsova,
  • Konstantin V. Larionov,
  • Liubov Yu. Antipina,
  • Pavel B. Sorokin and
  • Albert G. Nasibulin

Beilstein J. Nanotechnol. 2022, 13, 1564–1571, doi:10.3762/bjnano.13.130

Graphical Abstract
  • spectrum of Tuball SWCNTs after extraction features a distinctive S11 transition of SWCNTs at 990 nm, corresponding to (6,5)-chirality (Figure 3), unresolved before separation. The obtained absorption bands are slightly redshifted compared to the standard wavelengths of (6,5)-SWCNT absorption, which could
  • as the first fraction. Optical characterization UV–vis–NIR spectroscopy measurements were performed using a Perkin-Elmer Lambda 1050 spectrophotometer in the wavelength range of 400–1300 nm to avoid the immense absorption of water in the NIR and minimize the interference of riboflavin absorption with
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Published 22 Dec 2022

Photoelectrochemical water oxidation over TiO2 nanotubes modified with MoS2 and g-C3N4

  • Phuong Hoang Nguyen,
  • Thi Minh Cao,
  • Tho Truong Nguyen,
  • Hien Duy Tong and
  • Viet Van Pham

Beilstein J. Nanotechnol. 2022, 13, 1541–1550, doi:10.3762/bjnano.13.127

Graphical Abstract
  • chemical, thermal, and charge transport properties, which can shift the light absorption of TiO2 to the visible region [29][30][31][32]. An emerging new material in optoelectronics is g-C3N4 (bandgap of 2.65–2.7 eV) because it has an appropriate band structure with suitable energy levels regarding TiO2
  • spectroscopy (DRS) was carried out to measure the optical bandgap of the semiconductor materials through the Tauc method using the absorption coefficient α of the material, according to Equation 1 [42]: where h, ν, Eg, and B are the Planck constant, the frequency of the photon, the bandgap energy, and a
  • −1 [48]. Also, FTIR spectroscopy is used as an extremely effective technique for studying the vibrational states of organic bonds in g-C3N4 materials using the vibrational peaks of C–N bonds between 1640 and 1200 cm−1. A very strong absorption peak at 807.2 cm−1 characterizes the fluctuation of tri-s
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Published 16 Dec 2022

Non-stoichiometric magnetite as catalyst for the photocatalytic degradation of phenol and 2,6-dibromo-4-methylphenol – a new approach in water treatment

  • Joanna Kisała,
  • Anna Tomaszewska and
  • Przemysław Kolek

Beilstein J. Nanotechnol. 2022, 13, 1531–1540, doi:10.3762/bjnano.13.126

Graphical Abstract
  • previous publication of ours [19]. The absorption spectra of the catalysts showed noticeable differences (Figure 1b). Using the absorption spectra, the electron gap energies for M1 and M2 were determined to be 0.11 V and 1.75 V, respectively (Table 1) [20]. Phase identification of the magnetite structure
  • multimeter (CPC 411, Elmetron, Poland). External standards of seven concentration levels ranging from 1 × 10−5 to 1 × 10−3 mol·L−1 were used to quantify bromide ions. X-ray diffraction measurements of M1 (red), M2 (blue) (a), and UV–vis absorption spectra of M1 (red) and M2 (blue) (b). Figure 1a and 1b were
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Published 15 Dec 2022

A TiO2@MWCNTs nanocomposite photoanode for solar-driven water splitting

  • Anh Quynh Huu Le,
  • Ngoc Nhu Thi Nguyen,
  • Hai Duy Tran,
  • Van-Huy Nguyen and
  • Le-Hai Tran

Beilstein J. Nanotechnol. 2022, 13, 1520–1530, doi:10.3762/bjnano.13.125

Graphical Abstract
  • -scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and linear sweep voltammetry. The results show that the TiO2@MWCNTs nanocomposite has an optical bandgap of 2.5 eV, which is a significant improvement in visible-light absorption capability compared to TiO2 (3.14 eV). The
  • been developed to increase the absorption of visible solar light [6][7]. Notably, carbon nanotubes (CNTs) are a promising material for visible-light absorption [8]. A combination of TiO2 with CNTs can effectively enhance the separation of e−/h+ pairs based on the high electric conductivity of CNTs
  • . Herein, a TiO2@MWCNTs nanocomposite photocatalyst is synthesized via a simple hydrolysis method. The coupling of TiO2 and MWCNTs aims to limit the recombination of photogenerated electrons and holes, to improve the visible-light absorption of the photoanode under solar irradiation, and to enhance the
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Published 14 Dec 2022

In search of cytotoxic selectivity on cancer cells with biogenically synthesized Ag/AgCl nanoparticles

  • Mitzi J. Ramírez-Hernández,
  • Mario Valera-Zaragoza,
  • Omar Viñas-Bravo,
  • Ariana A. Huerta-Heredia,
  • Miguel A. Peña-Rico,
  • Erick A. Juarez-Arellano,
  • David Paniagua-Vega,
  • Eduardo Ramírez-Vargas and
  • Saúl Sánchez-Valdes

Beilstein J. Nanotechnol. 2022, 13, 1505–1519, doi:10.3762/bjnano.13.124

Graphical Abstract
  • give rise to a collective oscillation known as surface plasmon effect [34]. This effect can be monitored by UV–vis spectroscopy, where metal nanoparticles absorb radiation at different wavelengths depending on their size [36]. The UV–vis absorption spectra of the reactions at different temperatures are
  • shown in Figure 4. The absence of absorption of visible radiation is evident in the AgNO3 salt and in the pineapple peel extract. Instead, reactions at different temperatures showed absorption in this region of the electromagnetic spectrum. Furthermore, differences in the maximum values of the
  • absorption curves can be observed. Although in the reaction at room temperature (Ag/AgCl-Troom) the absorption maximum was not obvious, and it was in the case of the other reactions, the absorption maxima were easily identified. Ag/AgCl-T60 shows absorption maximum at 452 nm, Ag/AgCl-T80 at 484 nm, and Ag
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Published 13 Dec 2022

Facile preparation of Au- and BODIPY-grafted lipid nanoparticles for synergized photothermal therapy

  • Yuran Wang,
  • Xudong Li,
  • Haijun Chen and
  • Yu Gao

Beilstein J. Nanotechnol. 2022, 13, 1432–1444, doi:10.3762/bjnano.13.118

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  • specificity and minimal invasiveness, it has attracted a great deal of attention as complementary modality for conventional cancer therapy options [1]. Gold nanoparticles (AuNPs) can absorb light and generate heat from light absorption because of the surface plasmon resonance (SPR) phenomenon and the tunable
  • near-infrared (NIR) absorption [2]. Various gold nanoscale platforms, including nanostars, nanorods, nanospheres, nanoshells, and nanocages, have been designed as PTAs for PTT. Gold nanorods (ca. 50 nm), nanoshells (ca. 130 nm), and nanoparticles with large sizes (>50 nm) are suitable for PTT because
  • of strong NIR absorption [3]. However, particles with larger size are likely to have long resident times and slow elimination in tissues, which may lead to long-term toxicity. Commercially available AuNPs with particle sizes of 10–30 nm can be synthesized by the classical Turkevich method [4]. Rats
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Published 02 Dec 2022

Orally administered docetaxel-loaded chitosan-decorated cationic PLGA nanoparticles for intestinal tumors: formulation, comprehensive in vitro characterization, and release kinetics

  • Sedat Ünal,
  • Osman Doğan and
  • Yeşim Aktaş

Beilstein J. Nanotechnol. 2022, 13, 1393–1407, doi:10.3762/bjnano.13.115

Graphical Abstract
  • obstacles for successful treatment [15]. The low permeability of nanoformulations through the mucus layer prevents sufficient absorption of the drug and causes clearance of molecules which do not reach adequate retention time in the GIT [53]. Thus, increasing the retention time of the NPs on the mucus layer
  • absorption of drugs. Therefore, the Caco-2 cell line derived from a human colorectal carcinoma was employed to simulate the epithelial cell layer. A monolayer of cells should have a transepithelial electrical resistance of around 500 Ω·cm2 to show similarity with intestinal lumen [70][71][72]. In Table 5
  • -coated PLGA NPs. As a result, CS-coated PLGA NPs improved the oral absorption and remarkably increased the cellular uptake compared to unmodified PLGA NPs [74]. Conclusion Currently, many anticancer agents used in chemotherapy are administered parenterally. Significant advances in the field of oral
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Published 23 Nov 2022

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

  • Nirmalendu S. Mishra and
  • Pichiah Saravanan

Beilstein J. Nanotechnol. 2022, 13, 1380–1392, doi:10.3762/bjnano.13.114

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  • function by utilizing the Tauc plot mentioned in Equation 3. The obtained values were depicted in Figure 5a–e. The enhanced light absorption properties could be attributed to the grey/black colour of MBN and enhanced charge transfer attained due to the change in the electronic structure through the
  • formation of C–N moieties in the BN framework [16]. where h, α, c, E denote the Planck’s constant, absorption coefficient derived from the Lambert’s equation, speed of light (3 × 108 m s−1), and energy, respectively. The value of n (n = 4 for direct bandgap and n = 1 for indirect bandgap) depends upon the
  • nature of the electronic transition within the semiconductor. The HBN exhibited an absorption edge at about 220 nm corresponding to a bandgap (Eg) of 5.2 eV, whereas the bandgap of MBN materials was found to be 3.68, 3.41, and 2 eV for MBN-25, MNB-50, and MBN-80, respectively. The material capability to
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Published 22 Nov 2022

Supramolecular assembly of pentamidine and polymeric cyclodextrin bimetallic core–shell nanoarchitectures

  • Alexandru-Milentie Hada,
  • Nina Burduja,
  • Marco Abbate,
  • Claudio Stagno,
  • Guy Caljon,
  • Louis Maes,
  • Nicola Micale,
  • Massimiliano Cordaro,
  • Angela Scala,
  • Antonino Mazzaglia and
  • Anna Piperno

Beilstein J. Nanotechnol. 2022, 13, 1361–1369, doi:10.3762/bjnano.13.112

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  • reduction of AgNO3. The formation of small gold NPs (Figure 2) was confirmed by the presence of the LSPR band detected at 531 nm in the UV–vis spectrum. The subsequent addition of AgNO3 resulted in a change of the extinction spectrum with the formation of a higher and broader absorption band at 402 nm
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Published 18 Nov 2022

Near-infrared photoactive Ag-Zn-Ga-S-Se quantum dots for high-performance quantum dot-sensitized solar cells

  • Roopakala Kottayi,
  • Ilangovan Veerappan and
  • Ramadasse Sittaramane

Beilstein J. Nanotechnol. 2022, 13, 1337–1344, doi:10.3762/bjnano.13.110

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  • nanocrystals. The X-ray diffraction pattern confirms the hexagonal structure. Due to the near-infrared light absorption capability, the synthesized QDs were used as the sensitizer to fabricate QDSCs. The fabricated QDSCs were characterized by using electrochemical impedance spectroscopy and photovoltaic
  • [4][5][6][7]. At present, QDSCs have reached 14.4% efficiency. In QDSCs, QDs are added to the metal oxides. Our earlier reports demonstrated that porous TiO2 nanofibers possess an enormous surface area for the maximum absorption of QDs [8][9][10]. For the past decades, binary or ternary QDs based on
  • . Hence, they have application potential in optoelectronic devices. Herein, we synthesized, for the first time, Ag, Zn, Ga, S, and Se-based alloyed QDs (AZGSSe QDs) and investigated the optoelectric and morphological properties. Due to the near-infrared (NIR) light absorption, the QDs were used as
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Published 14 Nov 2022

Recent trends in Bi-based nanomaterials: challenges, fabrication, enhancement techniques, and environmental applications

  • Vishal Dutta,
  • Ankush Chauhan,
  • Ritesh Verma,
  • C. Gopalkrishnan and
  • Van-Huy Nguyen

Beilstein J. Nanotechnol. 2022, 13, 1316–1336, doi:10.3762/bjnano.13.109

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  • environmental restoration and energy conversion is photocatalysis powered by solar light. Traditional photocatalysts have limited practical uses due to inadequate light absorption, charge separation, and unknown reaction mechanisms. Discovering new visible-light photocatalysts and investigating their
  • photocatalytic effectiveness of those semiconductors is inadequate for practical environmental and energy conservation applications because of substantial electron–hole recombination and a low capacity for the absorption of visible light. Numerous attempts have been made, with an emphasis on doping, the creation
  • in rapid recombination [43]. In addition to a low rate of recombination, other essential qualities of a superior photocatalyst include broad sunlight absorption and enough redox capacity. A small bandgap is desirable regarding a broad light absorption band. However, when redox ability is considered
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Published 11 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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  • particles were homogeneous; the maximum absorption wavelength was 518 nm with narrow peak width in the UV spectrophotometer 400–700 nm scan; the purified HBsAg Mab concentration was 65 mg/mL; the optimal protein protection amount was 32.5 μg per mL of colloidal gold at pH 8.2; the quality of the probe was
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Published 03 Nov 2022

Roll-to-roll fabrication of superhydrophobic pads covered with nanofur for the efficient clean-up of oil spills

  • Patrick Weiser,
  • Robin Kietz,
  • Marc Schneider,
  • Matthias Worgull and
  • Hendrik Hölscher

Beilstein J. Nanotechnol. 2022, 13, 1228–1239, doi:10.3762/bjnano.13.102

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  • polymeric pads are 48 mm in diameter and filled with an oil-absorbing material. On the outside, they are covered with superhydrophobic and oleophilic nanofur, which repels water and attracts oil at the same time. In order to utilize this feature in an efficient way and to allow for continuous oil absorption
  • contact angle measurements, especially on hydrophobic surfaces, can further distort the measured values [30]. The quality of the nanofur in terms of its hydrophobicity and oil absorption quantity depends on several processing factors including length of the hairs, their density, and their overall
  • account [30]. To illustrate the superhydrophobic properties of the nanofur, the video in Supporting Information File 1 shows water drops on a polypropylene sheet rolling around as the sheet is tilted. The high contact angle can be seen even with the naked eye. Since oil absorption is one of the
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Published 31 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

Graphical Abstract
  • resonance [10], Fourier transform infrared spectrometry (FTIR) [11], UV–vis absorption spectrometry [12], mass spectrometry (MS) [13], titration microcalorimetry [14], high-performance liquid chromatography (HPLC) [15], gas chromatography (GC), capillary electrophoresis (CE) [16], and electrochemical chiral
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Published 27 Oct 2022

Application of nanoarchitectonics in moist-electric generation

  • Jia-Cheng Feng and
  • Hong Xia

Beilstein J. Nanotechnol. 2022, 13, 1185–1200, doi:10.3762/bjnano.13.99

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  • between absorption and evaporation. Whether there is an upper limit for the dynamic balance is not clear for the time being, but the qualitative conclusion conforms to basic logic and is still used as a guiding principle for improving the output power. In terms of airflow direction, the output voltage is
  • absorption of samples with different hydroxy group content and structural collapse of samples with high hydroxy group content. Figure 7c–f were reproduced from [80], Li, Mingjie et al., “Biological Nanofibrous Generator for Electricity Harvest from Moist Air Flow”, Adv. Funct. Mater., with permission from
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Published 25 Oct 2022

Microneedle-based ocular drug delivery systems – recent advances and challenges

  • Piotr Gadziński,
  • Anna Froelich,
  • Monika Wojtyłko,
  • Antoni Białek,
  • Julia Krysztofiak and
  • Tomasz Osmałek

Beilstein J. Nanotechnol. 2022, 13, 1167–1184, doi:10.3762/bjnano.13.98

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  • externally administered drugs, rate and degree of absorption depend on the time the drug remains at the application site [43]. Up to 95% of the eye surface is covered by the sclera, which is well permeable to substances smaller than 70 kDa, including neuroprotective, antioxidant, or anti-angiogenic agents
  • . For comparison, the cornea permeates substances with a mass not greater than 1 kDa [28]. Unfortunately, transscleral absorption is often reduced by elimination via nasolacrimal drainage pathways, tear protein binding, or drug metabolism [44]. The treatment efficiency is also decreased by constant
  • photopolymerization of photosensitive polymers, but in this case each layer of the polymer is projected as whole [152]. A more complicated method is two‑photon polymerization (TPP), which uses a near-infrared beam instead of UV radiation. TPP initiates the polymerization of the resin by multiphoton absorption [153
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Published 24 Oct 2022

Rapid fabrication of MgO@g-C3N4 heterojunctions for photocatalytic nitric oxide removal

  • Minh-Thuan Pham,
  • Duyen P. H. Tran,
  • Xuan-Thanh Bui and
  • Sheng-Jie You

Beilstein J. Nanotechnol. 2022, 13, 1141–1154, doi:10.3762/bjnano.13.96

Graphical Abstract
  • are different approaches to mitigate NO pollution, including catalyst/non-catalyst [4], oxidation [5], bioprocesses [6], adsorption [7], absorption [8], and non-thermal plasma technologies [9]. Photocatalytic oxidation is considered a promising approach due to its ability to degrade various air
  • oxide with wide bandgap (3.5–5 eV), high availability, non-toxicity, low cost, and native structural defects [18][19]. The large bandgap energy is the limitation of MgO, reducing the photocatalytic performance and applicability of MgO [20]. Various efforts have been made to enhance the absorption in the
  • equation as described in Equations 5–7 [43]: where E is the photon energy (eV), h is Planck’s constant (4.132·10−15 eV·s), ν is the photon frequency (s−1), c is the velocity of light (nm·s−1), λ is the wavelength (nm), α is the absorption coefficient, B is a constant, and Eg is the bandgap energy (eV), R
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Published 18 Oct 2022

Green synthesis of zinc oxide nanoparticles toward highly efficient photocatalysis and antibacterial application

  • Vo Thi Thu Nhu,
  • Nguyen Duy Dat,
  • Le-Minh Tam and
  • Nguyen Hoang Phuong

Beilstein J. Nanotechnol. 2022, 13, 1108–1119, doi:10.3762/bjnano.13.94

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  • Equation 3. Figure 8 shows the degradation absorption spectra of MO and MB by synthesized ZnO under visible and UV light for different time intervals. The intensity of the peak decreased with increasing irradiation time. The results in Figure 9 show that the degradation efficiency of MB and MO solutions
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Published 07 Oct 2022

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

  • Aisha Kanwal,
  • Naheed Bibi,
  • Sajjad Hyder,
  • Arif Muhammad,
  • Hao Ren,
  • Jiangtao Liu and
  • Zhongli Lei

Beilstein J. Nanotechnol. 2022, 13, 1068–1107, doi:10.3762/bjnano.13.93

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Published 05 Oct 2022
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