Article
Chemistry, Multidisciplinary
Ting Xiao, Jie Zhao, Peng Sun, Peng Li, Yaokang Zhang, Ni Zhao, Zhiwei Ren, Gang Li, Zhifeng Huang, Zijian Zheng
Summary: The study introduces a new type of broadband-transmitting built-in TiO2 metalens that can enhance the sensitivity, speed, and efficiency of photodetectors.
Article
Engineering, Electrical & Electronic
Vinit Kumar Yadav, Amitabha Nath, Abhijit Das, Julaiba Tahsina Mazumder, Mitra Barun Sarkar
Summary: Enhanced photosensing performance was reported for Indium nanoparticles capped TiO2 nanowire array using GLAD technique, showing high ideality factor and improved photoresponsivity. The ON/OFF switching irradiation for the In NPs based photosensor increased with quick rise and fall times.
IEEE ELECTRON DEVICE LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Zijian Zhou, Kai Ou, Jiahong Dai, Wenting Zhang, Yongliang Tang, Yuxiang Ni, Yudong Xia, Hongyan Wang
Summary: In this study, multifold TiO2 nanorods with highly efficient photocatalytic performance for H-2 production were prepared using electron beam evaporation. The effects of annealing temperature and morphological structure on the photocatalytic performance were investigated. The optimal annealing conditions were found to be 550°C for 300 min in air. The multifold nanorods showed improved photocatalytic performances compared to the no-fold nanorods, with Z2 achieving a maximum photocurrent density of 1.35 mA/cm(2), which was six times higher than Z0 (0.2 mA/cm(2)). The smaller overall charge transfer resistance and larger BET surface area of Z2 were identified as the reasons for the maximum photocurrent density. The increase in specific surface area and number of active sites in the multifold structure contributed to the improved photocatalytic performance.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Ceramics
Adyasha Samal, Annu Kumar Lakshya, Shyam Murli Manohar Dhar Dwivedi, Avijit Dalal, Anupam Ghosh, Argha Deep Paul, Rajat Mahapatra, Rajeev Kumar Gupta, Mohammed Adnan Hasan, Arjun Dey, Aniruddha Mondal
Summary: VO2 nano-columns were fabricated using GLAD technique with a TiO2 cap-layer for phase protection, XRD and FTIR analysis revealed the presence of different oxidation states, and the sample exhibited a stable phase transition temperature and resistance drop at 66 degrees Celsius. Small-radius polaron model and Fermi-Dirac theory were used to calculate sheet resistance and carrier density.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
F. Grigoriev, V. B. Sulimov, A. Tikhonravov
Summary: This study applied a large-scale molecular dynamics approach to investigate the deposition of TiO2 thin films, exploring the surface roughness, porosity, and formation of nanostructures under different deposition conditions. Structural parameters of elongated pores in the films were determined using a Monte Carlo based method, and the difference in refractive index tensor components was calculated for films deposited at glancing angles.
COMPUTATIONAL MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
Gaurav Shukla, S. Angappane
Summary: The study demonstrates the successful growth of high temperature stable anatase phase TiO2 nanostructures using the glancing angle deposition technique. The annealed TiO2 nanorods exhibit unique wetting properties, with the structural contribution playing a key role in contact angle and increasing hydrophobicity over time.
APPLIED SURFACE SCIENCE
(2022)
Article
Biochemistry & Molecular Biology
Lijian Meng, Tao Yang
Summary: Nanostructured TiO2 films were deposited on Indium Tin Oxide (ITO) and glass substrates using dc reactive magnetron sputtering at various substrate inclination angles. The structural and optical properties of the films were analyzed using X-ray diffraction, scanning electron microscopy, and UV-Vis spectrophotometer. Dye-sensitized solar cells (DSSC) were constructed with these TiO2 films as photoelectrodes, and the impact of substrate inclination angle during film preparation on DSSC conversion efficiency was investigated.
Article
Materials Science, Ceramics
Sanjib Mondal, Chiranjib Ghosh, S. M. M. Dhar Dwivedi, Anupam Ghosh, Sushama Sushama, Subhananda Chakrabarti, Aniruddha Mondal
Summary: Glancing angle deposition (GLAD) was used to synthesize plasmonic Silver nanoparticles (NPs) on chemically prepared Erbium-doped Titanium dioxide thin films (TFs). The presence of Ag NPs enhanced the optical properties of the TFs, leading to improved photo-responsivity in the UV spectral range. The plasmonic photodetector (PD) showed better performance compared to the Er:TiO2 TF-based PD, including higher photo-responsivity and improved detectivity in the UV region.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Zhongwei Wu, Peng Li, Jie Zhao, Ting Xiao, Hong Hu, Peng Sun, Zehan Wu, Jianhua Hao, Chunlin Sun, Haoli Zhang, Zhifeng Huang, Zijian Zheng
Summary: In this study, TiO2 nanopillar arrays were directly deposited on flexible substrates using glancing angle deposition at low substrate temperature, improving the performance and stability of flexible PSCs.
ADVANCED MATERIALS INTERFACES
(2021)
Article
Multidisciplinary Sciences
Xin-Xian Wu, Cheng-Yu Lu, Tsung-Yu Huang
Summary: In this study, an oblique-flat-sheet metamaterial perfect absorber (MPA) was designed to enhance the sensitivity of a biosensor. By simulating and conducting experiments, it was confirmed that the MPA had higher sensitivity.
SCIENTIFIC REPORTS
(2022)
Article
Physics, Applied
Shaozhong Ou, Jianguo Wang, Yuan'an Zhao, Xiaofeng Liu, Zhichang Mo, Kun Wang, Chunxian Tao
Summary: This paper presents a comparative study on the optical, morphological, and laser-induced damage characteristics of rubbed polyimide, SiO2 thin films by glancing angle deposition, and the corresponding liquid crystal (LC) retarders. The results show that the SiO2 thin films have good transmittance and resistance to laser damage, with transmittance above 92% in the wavelength range of 400-1200 nm. The laser-induced damage threshold of SiO2 thin films is 32.6 J/cm(2), surpassing that of traditional polyimide (PI) alignment films.
MODERN PHYSICS LETTERS B
(2023)
Article
Chemistry, Analytical
Perla Yanet Rosales Medina, Fernando Avelar Munoz, Elida Flores Sigala, Roberto Gomez Rosales, Javier Alejandro Berumen Torres, Jose de Jesus Araiza Ibarra, Hugo Tototzintle Huitle, Victor Hugo Mendez Garcia, Jose Juan Ortega Sigala
Summary: In this study, the growth of nanocolumnar titanium dioxide (TiO2) films using the magnetron sputtering technique and the glancing-angle deposition configuration was explored. Optimized growth parameters resulted in the formation of TiO2 nanocolumns with a cross-sectional diameter ranging from 50 to 75 nm. Additionally, a correlation was observed between the quality of the initial layer and the enhanced growth of the TiO2 nanocolumns.
Article
Nanoscience & Nanotechnology
Rajnarayan De, S. Maidul Haque, M. K. Sikdar, P. K. Sahoo, K. Divakar Rao
Summary: The study utilized a modified glancing angle deposition (GLAD) technique to prepare single-sided TiO2 thin films, with an additional flux collimation plate introduced to enhance the collimation of depositing vapour flux. The reduction in TiO2 film refractive index was observed with increasing distance from the vapour source, resulting in excellent anti-reflection properties in coatings deposited at distant positions. The research demonstrates the lowest refractive index of TiO2 achieved together with the fabrication of a TiO2-based broadband single-layer anti-reflection coating.
Article
Chemistry, Physical
J. Potocnik, N. Bozinovic, M. Popovic, T. Barudzija, M. Nenadovic, M. Novakovic
Summary: In this study, copper thin films with zigzag and square spiral nanostructures were deposited using glancing angle deposition. The morphological, chemical, structural, optical, and electrical properties of the films were investigated. The results showed that the porousness and growth mechanism of the nanostructures significantly influenced the properties of the films, and the optical and electrical properties were closely related to the concentration of defects.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Mengsheng Yang, Kewei Gao, Pifeng Xing, Taimin Yi, Zhibing He, Bo Ke
Summary: Gold nanoarray films prepared by glancing angle deposition exhibit different thermal stabilities and degradation mechanisms based on their structural features at different temperatures.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jaime del Moral, Laura Montes, Victor Joaquin Rico-Gavira, Carmen Lopez-Santos, Stefan Jacob, Manuel Oliva-Ramirez, Jorge Gil-Rostra, Armaghan Fakhfouri, Shilpi Pandey, Miguel Gonzalez del Val, Julio Mora, Paloma Garcia-Gallego, Pablo Francisco Ibanez-Ibanez, Miguel Angel Rodriguez-Valverde, Andreas Winkler, Ana Borras, Agustin Rodriguez Gonzalez-Elipe
Summary: The use of acoustic waves for de-icing and anti-icing purposes shows promising potential, as it provides a synergistic effect when combined with surface modifications. Experiments conducted in laboratory and icing wind tunnel settings demonstrate the real-time monitoring capabilities of acoustic wave devices in icing processes.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Andrea Rubino, Gabriel Lozano, Mauricio E. Calvo, Hernan Miguez
Summary: This study extracts the optical constants of ligand-free perovskite lead halide quantum dots using a scaffold assisted synthetic method. The results indicate a strong dependence of the optical constants on the quantum dot size. This analysis provides important information for the modeling of solar cells and light-emitting diodes based on perovskite quantum dots.
Article
Nanoscience & Nanotechnology
Jorge Gil-Rostra, Javier Castillo-Seoane, Qian Guo, Ana Belen Jorge Sobrido, Agustin R. Gonzalez-Elipe, Ana Borras
Summary: This work proposes a new architecture of photoelectrodes consisting of supported multishell nanotubes fabricated by a soft-template approach. The obtained NT electrodes have a large electrochemically active surface and outperform the efficiency of equivalent planar-layered electrodes by more than one order of magnitude. The characteristics of the WO3/BiVO4 Schottky barrier heterojunction control the NT electrode efficiency, which depends on the BiVO4 outer layer thickness and the incorporation of the CoPi electrocatalyst, as demonstrated by thorough electrochemical analysis.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Gerardo Asensio, Ana M. Hernandez-Arriaga, Marcela Martin-del-Campo, M. Auxiliadora Prieto, Agustin R. Gonzalez-Elipe, Luis Rojo, Blanca Vazquez-Lasa
Summary: The accumulation of bacteria over implant surfaces is the main cause of failure, and the development of antimicrobial surfaces is crucial. Additionally, the durability and mechanical performance of implants are determined by their osseointegration capacity and infection prevention. Therefore, bioactive surfaces are being researched to improve implant osseointegration and infection prophylaxis.
APPLIED SURFACE SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
A. M. Alcaide, G. Regodon, F. J. Ferrer, V Rico, R. Alvarez, T. C. Rojas, A. R. Gonzalez-Elipe, A. Palmero
Summary: The formation of monoclinic VO2 crystal domains at low temperatures in nanocolumnar vanadium/oxygen thin films deposited via magnetron sputtering is analyzed. The synthesis involved depositing amorphous nanocolumnar VO1.9 thin films at room temperature and annealing them at temperatures between 250 - 330 ? in an oxygen atmosphere. The nanocolumnar structures exhibited a thermochromic transition at 47 ? (for annealing at 270 ?) and 58 ? (for annealing at 280 and 290 ?), resulting in a significant drop in optical transmittance in the infrared region.
Article
Chemistry, Multidisciplinary
Paula Navascues, Juan Garrido-Garcia, Jose Cotrino, Agustin R. Gonzalez-Elipe, Ana Gomez-Ramirez
Summary: This study investigates the synthesis of ammonia using plasma-catalysis and examines the role of various catalyst materials. The results show that while ruthenium particles have some catalytic activity under certain conditions, they do not significantly improve the yield and energy efficiency of ammonia synthesis. The ferroelectric material and the alumina coating play important roles in regulating discharge and cooling the plasma, respectively.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Rafael Alvarez, Guillermo Regodon, Hiedra Acosta-Rivera, Victor Rico, German Alcala, Agustin R. Gonzalez-Elipe, Alberto Palmero
Summary: This paper studied the morphology and void connectivity of thin films grown by magnetron sputtering deposition at oblique geometries. A well-tested thin film growth model was used, along with experimental data, to assess the features of these layers. The film morphology and pore topology varied significantly with the growth conditions, which were linked to the different collisional transport of sputtered species in the plasma gas. Four different film morphologies were identified, and their porous network characteristics were described, explaining their potential applications in electrochromic sensors or infiltration with nanoparticles.
Article
Materials Science, Multidisciplinary
Stefan Jacob, Shilpi Pandey, Jaime Del Moral, Atefeh Karimzadeh, Jorge Gil-Rostra, Agustin R. Gonzalez-Elipe, Ana Borras, Andreas Winkler
Summary: This study successfully demonstrates the de-icing functionality of large areas covered with thick layers of glaze ice using nanoscale activation by surface acoustic waves. The method shows potential for practical applications in various industries.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Nanoscience & Nanotechnology
Felix Carrascoso, Hao Li, Jose M. Obrero-Perez, Francisco J. Aparicio, Ana Borras, Joshua O. Island, Angel Barranco, Andres Castellanos-Gomez
Summary: By using an adamantane plasma polymer pinning layer, we achieve unprecedented crystal strains of 2.8% in monolayer molybdenum disulfide. The strain gauge factors for the A and B excitons of monolayer MoS2 are reported as -99.5 meV/% and -63.5 meV/%, respectively, with a 50 nm adamantane capping layer. Photoluminescence and Raman measurements on the same samples confirm these results. Overall, our study demonstrates that adamantane polymer is an exceptional capping layer for transferring substrate-induced strain to a 2D layer and achieving higher levels of crystal strain.
NPJ 2D MATERIALS AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
V. Rico, G. F. Regodon, A. Garcia-Valenzuela, A. M. Alcaide, M. Oliva-Ramirez, T. C. Rojas, R. Alvarez, F. J. Palomares, A. Palmero, A. R. Gonzalez-Elipe
Summary: In this study, a novel methodology of plasma-assisted thin film structuration was proposed by combining piezoelectric AWs and plasmas during the growth of a thin film. SiO2 and SiOx (x<2) thin films were deposited by magnetron sputtering at oblique angles (MS-OAD) on an electro-acoustically excited LiNbO3 piezoelectric substrate under resonant conditions. The resulting films exhibited 2D patterned microstructure with submillimeter size intermingled zones, which replicated the distribution of polarization potential on the AW activated substrate immersed in the plasma. The main mechanism responsible for the appearance of domains with different morphology and chemical composition was found to be the focused impingement of Ar+ plasma ions on certain regions of the substrate. The discussed the general character of this patterning process, the underlying physics, and its possibilities to tailor the composition and microstructure of dielectric thin film materials.
Article
Chemistry, Multidisciplinary
Elena Cabello-Olmo, Manuel Romero, Michael Kainz, Anna Bernroitner, Sonja Kopp, Michael Muehlberger, Gabriel Lozano, Hernan Miguez
Summary: This paper demonstrates a versatile and scalable method for preparing periodically corrugated nanophosphor surface patterns that exhibit strongly polarized and directional visible light emission. The combination of inkjet printing and soft lithography techniques is used to create arbitrarily shaped light emitting motifs. These pre-designed luminescent drawings, with polarization and angular properties controlled by the surface relief, can be used as anti-counterfeiting labels, offering additional means to identify unauthorized or forged copies of protected items. The potential of this approach is exemplified by creating a self-standing photoluminescent quick response code with polarized and directionally beamed emission. The directional out-coupled photoluminescence observed is explained through finite-difference time-domain calculations.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Victor Castaing, Manuel Romero, Juan Torres, Gabriel Lozano, Hernan Miguez
Summary: This paper proposes a novel approach based on resonant optical nanostructures to enhance the properties of persistent luminescence in thin coatings. By integrating TiO2 scattering spheres in the coatings made of ZnGa2O4:Cr3+ PersLNPs, the afterglow intensity is significantly increased and the charging speed is accelerated.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Roman Buchheit, Bart-Jan Niebuur, Lola Gonzalez-Garcia, Tobias Kraus
Summary: In this study, hybrid dielectrics were prepared using nanoparticles with gold cores and covalently bound thiol-terminated polystyrene shells. The microstructure of these dielectrics was investigated, and it was found that the arrangement of nanoparticles depended on the ligand length and core diameter. The dielectric constants were mainly influenced by the polarization at the gold-polystyrene interfaces, and the electric breakdown of the dielectric layers depended on the particle packing.
Article
Materials Science, Multidisciplinary
Alberto Jimenez-Solano, Jose Maria Miranda-Munoz, Sol Carretero-Palacios, Hernan Miguez
Summary: Nanoporous media scatter light due to the presence of air bubbles or solid aggregates, leading to weak scattering effects. Standard theoretical approaches ignore certain scattering components, but our optical modeling approach captures all spectral components and the angular distribution of scattered light. By using a Monte Carlo approach, we are able to decode the size distribution and internal structure of a nanocrystalline titania film.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Manuel Romero, Juan Ramon Sanchez-Valencia, Gabriel Lozano, Hernan Miguez
Summary: This work investigates the influence of the optical environment on the radiative decay rate of rare-earth transitions in luminescent nanoparticles forming a thin film, both theoretically and experimentally. By using finite-difference time-domain simulations and experiments, we propose modifications to existing analytical models for calculating the radiative decay rate and successfully achieve gradual and controllable alteration of the effective refractive index in luminescent films. Our research provides valuable insights for the rational tuning of the spontaneous decay rate and photoluminescence quantum yield in luminescent nanoparticle ensembles.