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Article
Chemistry, Multidisciplinary
Anik Kumar Ghosh et al.
Summary: Metal-semiconductor nanostructures are widely used in photodetection, photocatalysis, and photovoltaics. In photodetection, the resistance typically decreases with the generation of charge carriers upon illumination, but an opposite response, an increase in resistance, is observed in interconnected metal-semiconductor gratings. This study presents a fabrication method using wrinkle structuring and oblique angle material deposition to create photoresistors with large-area periodic structures and cracks that serve as connections for two-point contact measurements. It is also found that an additional deposition of an amorphous titania layer further enhances the current reduction on photoexcitation.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Junzhi Ye et al.
Summary: Photoinduced enhanced Raman spectroscopy (PIERS) is a new surface enhanced Raman spectroscopy (SERS) modality with a 680% Raman signal enhancement of adsorbed analytes over that of SERS. In this study, the atomic-scale mechanism behind PIERS is elucidated using various spectroscopic and simulation techniques. The key factor contributing to the PIERS enhancement compared to SERS is the increase in Raman polarizability of the adsorbed analyte through photoinduced charge transfer. This work provides insights for the rational design of PIERS substrates for sensing applications.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Pin Lyu et al.
Summary: Photocatalysis induced by localized surface plasmon resonance of metallic nanoparticles has been extensively studied for over a decade, while photocatalysis originating from direct interband excitations remains understudied. This article proposes a classification of photoexcitation into intra- and interband transitions based on the well-defined physical states of hot carriers. Intra- and interband transitions are characterized by the generation of hot electrons above the Fermi level and hot d-band holes below the Fermi level, respectively, suggesting different catalytic pathways. The wavelength dependence of photocatalytic activities provides valuable insights into the contributions of different transitions and carriers.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
S. Yergaliyeva et al.
Summary: In this work, composite thin films consisting of titanium dioxide and noble metal nanoparticles (silver, gold, and bimetallic silver/gold alloys) were synthesized using RF magnetron sputtering. The resulting thin films were characterized using various techniques, including TEM, SEM, XRD analysis, and Raman spectroscopy. The study showed that annealing in an argon atmosphere induced crystallization in the initially amorphous TiO2 matrix. The composite films exhibited two light absorption regions, one associated with localized surface plasmon resonance (LSPR) phenomena and the other due to the energy band gap. The composition of the metal nanoparticles could be adjusted to tune these parameters in the composite films.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Chemistry, Multidisciplinary
Andrea Brognara et al.
Summary: The photo-induced enhanced Raman spectroscopy (PIERS) effect occurs when plasmonic nanoparticles on a semiconductor are illuminated by UV light before Raman measurement. The PIERS effect typically lasts for about an hour, with the proposed mechanism being the creation of oxygen vacancies in the semiconductor to facilitate charge transfer. However, this hypothesis has not been experimentally confirmed. In this study, gold nanoparticles co-deposited with porous TiO2 as a PIERS substrate exhibit the highest measured intensity and significantly longer duration (at least 8 days). Cathodoluminescence measurements reveal two distinct mechanisms for co-deposited and drop-casted gold nanoparticles, with the oxygen vacancies hypothesis leaning towards confirmation for the latter, while the narrowing of the depletion zone explains the prolonged PIERS effect.
Article
Materials Science, Coatings & Films
Oleg Prikhodko et al.
Article
Nanoscience & Nanotechnology
Junji Guo et al.
Summary: The study introduces a low-cost, eco-friendly hybrid cation electrolyte for amorphous metal oxides to exhibit excellent optical performance, addressing issues related to structural stability and cycling lifetime.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Multidisciplinary
Swagato Sarkar et al.
Summary: The challenges of plasmonic charge transfer on a large scale with low losses are investigated through optical designs using 1D plasmonic lattice structures. These structures guide energy to sub-wavelength titanium dioxide layers to create photonic crystal slabs. Photodetection at near semiconductor bandgap energy levels is achieved, and the ability to access other wavelengths across the solar spectrum for energy harvesting is demonstrated through hybrid plasmonic-photonic modes.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Review
Chemistry, Physical
Kanika Khurana et al.
Summary: Plasmonic resonance in metallic nanoparticles has led to intensive research in nanoscale optics and sensors, enhancing electromagnetic wave interactions and sensitivity of sensors. The advantages, challenges, and innovative approaches for improving sensitivity and detection limits of different nanostructures and detection systems have been elaborated in this review.
Article
Chemistry, Multidisciplinary
Anna P. Souri et al.
Summary: The increasing air pollution due to human activities has a new impact on health. Heterogeneous photocatalysis is a promising method for degrading VOCs, making it important to search for new and improved photocatalysts. Perovskite-related materials ATiO(3) with A = Mg, Ni, Co, Zn were synthesized and ZnTiO3 showed the highest photoactivity under LED illumination.
APPLIED SCIENCES-BASEL
(2021)
Article
Chemistry, Multidisciplinary
Napat Lertthanaphol et al.
Summary: In this study, precious metal-doped TiO2/GO composites were synthesized using a one-step hydrothermal process, with Cu-TiO2/GO showing the best photocatalytic performance in converting CO2 to ethanol, with an ethanol production rate of 233 mu mol/gcat h. This superiority can be attributed to a combined effect of key parameters such as optical band gap, crystallite size, and BET surface area.
Article
Chemistry, Multidisciplinary
Vaibhav Gupta et al.
Summary: Imprint lithography, a combination of interference lithography and nanosphere imprint lithography, is an effective and direct method for patterning nanostructures on various substrates. This technique allows for the fabrication of nanodevices with high yield and quality, marking a milestone for large-scale implementation in optoelectronic devices.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Ceramics
S. Limwichean et al.
Summary: The tungsten trioxide nanostructure thin films fabricated by MS-GLAD technique show enhanced PEC efficiency compared to single layer samples, with various morphologies available and detailed analysis on chemical composition and work function.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Aiymkul Markhabayeva et al.
Summary: A simple chemical bath deposition method was used to study the formation of nanoplate morphology of tungsten oxide, which showed higher specific area and photocatalytic activity compared to nanopowders obtained by the hydrothermal method.
Article
Materials Science, Multidisciplinary
Alexa Guglielmelli et al.
Summary: Thermoplasmonics involves generating and manipulating nanoscale heating with noble metallic nanoparticles, particularly gold nanoparticles (AuNPs) capable of light-triggered thermal effects. Temperature-sensitive materials like liquid crystals and hydrogels can detect and respond to the temperature variations induced by AuNPs.
ADVANCED PHOTONICS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Jesse Daughtry et al.
Summary: The research aims to examine the properties required for producing thin films of TiO2 using RF plasma, with the ability to modify the films through heating to induce defects and change their characteristics. Different deposition regimes were studied to minimize unwanted contaminants and the resulting TiO2 films showed a lower cost alternative to single-crystal TiO2 with known elemental composition and modifiable properties.
NANOSCALE ADVANCES
(2021)
Article
Materials Science, Multidisciplinary
Fatemeh Shariatmadar Tehrani et al.
MATERIALS RESEARCH EXPRESS
(2020)
Review
Chemistry, Physical
Guillaume Baffou et al.
Article
Chemistry, Physical
Zeinab Chehadi et al.
APPLIED CATALYSIS A-GENERAL
(2019)
Article
Chemistry, Physical
M. R. Alfaro Cruz et al.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Aoqun Jian et al.
APPLIED SURFACE SCIENCE
(2019)
Article
Chemistry, Physical
Baoshun Liu et al.
APPLIED SURFACE SCIENCE
(2019)
Review
Chemistry, Analytical
Roberto Pilot et al.
Article
Chemistry, Physical
Yu Liang et al.
Article
Chemistry, Physical
Dimitar A. Panayotov et al.
ACS ENERGY LETTERS
(2017)
Article
Chemistry, Physical
R. Jolly Bose et al.
APPLIED SURFACE SCIENCE
(2016)
Review
Chemistry, Multidisciplinary
Michael Dahl et al.
Review
Chemistry, Physical
Kazuya Nakata et al.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS
(2012)
Article
Nanoscience & Nanotechnology
M. Torrell et al.
JOURNAL OF NANO RESEARCH
(2012)
Review
Chemistry, Multidisciplinary
Kathryn M. Mayer et al.
Article
Chemistry, Multidisciplinary
Zuwei Liu et al.
Article
Chemistry, Multidisciplinary
Y Tian et al.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2005)
