Article
Chemistry, Multidisciplinary
Ziga Jelen, Marcin Krajewski, Franc Zupanic, Peter Majeric, Tilen Svarc, Ivan Anzel, Jernej Ekar, Sz-Chian Liou, Jerzy Kubacki, Mateusz Tokarczyk, Rebeka Rudolf
Summary: A coupled process of ultrasonic spray pyrolysis and lyophilisation was used for synthesizing dried gold nanoparticles. Uniaxial microcompression and differential scanning calorimetry (DSC) analysis were applied to determine their melting temperature. Uniaxial microcompression resulted in sintering at room temperature, making it impossible to evaluate the melting point. Using DSC, the melting point of the dried gold nanoparticles was measured to be around 1064.3 degrees C, close to pure gold. The absence of melting point depression was due to the exothermic sintering between 712 and 908.1 degrees C.
NANOTECHNOLOGY REVIEWS
(2023)
Article
Engineering, Electrical & Electronic
K. Souleh, T. Smain, H. Lidjici, B. Lagoun, M. Boucenna, N. Bouarissa
Summary: The first-principles density-functional calculations were applied to study the band structure and magnetization of Zn1-xCoxO ternary magnetic alloys in three phases. The alloy was found to exhibit semiconductor character with gap nature dependent on the phase. Analysis of electronic charge density revealed a partially covalent bonding in ZnO, which weakens with increasing Co concentration. CoO was observed to have different total magnetizations in different phases.
OPTICAL AND QUANTUM ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
C. E. R. F. Vieira, D. A. W. Soares, M. P. F. de Godoy, M. J. da Silva, L. M. B. Vargas, D. C. Alves, F. S. Pena, D. P. A. Holgado, A. K. Okazaki, P. H. O. Rappl, E. Abramof, M. L. Peres
Summary: The heat sensitivity of Zn1-xCdxO films is found to be related to structural phase transition, with surface morphology dependent on substrate type and Cd concentration. Samples grown on Si substrates exhibit higher thermal sensitivity and signal quality, making the films suitable for practical applications within a strategic temperature range of 50-100 degrees C.
MATERIALS RESEARCH BULLETIN
(2021)
Article
Materials Science, Multidisciplinary
Shih-Chen Shi, Po-Wei Huang, Jason Hsiao-Chun Yang
Summary: A newly developed method for preparing large-scale transparent conductive zinc oxide films was successfully demonstrated, showcasing the potential for large-scale synthesis by lowering the preparation temperature and improving the quality of coatings under atmospheric conditions.
Article
Engineering, Environmental
Lu Wang, Ting Li, Liangliang Tao, Hanwu Lei, Peiyong Ma, Jian Liu
Summary: A Copper-doped porous carbon nanospheres film (Cu@PCNF) was synthesized via one-step ultrasonic spray pyrolysis (USP) for photocatalytic degradation of methyl orange (MO). The film showed a high photocatalytic degradation rate under sunlight and maintained good reusability and durability after multiple cycles. This synthesis technology provides a simple and effective strategy for improving the photocatalytic performance of contaminant treatment materials.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2022)
Article
Materials Science, Multidisciplinary
Srecko Stopic, Felix Wenz, Tatjana-Volkov Husovic, Bernd Friedrich
Summary: The synthesis of silica particles through ultrasonic spray pyrolysis at high temperature allows for controlled morphology and size, with experimental results matching theoretical calculations. Characterization using X-ray diffraction and scanning electron microscopy is common practice. Compared to other methods, ultrasonic spray offers the advantages of easy setup of individual process segments, one-step continuous synthesis, and the ability to synthesize nanoparticles from various precursors.
Article
Materials Science, Multidisciplinary
Shou-Feng Xue, Yi-Juan Li, Feng-Hua Zheng, Xue Bian, Wen-Yuan Wu, Cheng-Hao Yang
Summary: CeO2 microspheres were prepared by one-step ultrasonic spray pyrolysis method and demonstrated to have particle sizes ranging from 0.01 to 1.08 μm, with the majority being less than 0.5 μm. However, the presence of residual chlorine in the fabricated microspheres negatively impacted the performance of SOFC. A water washing method was effective in reducing the residual chlorine content in CeO2 microspheres, providing a cleaner manufacturing process for SOFC electrode/electrolyte materials.
Article
Materials Science, Ceramics
Andre L. da Silva, Fabiane J. Trindade, Jean-Lou Dalmasso, Bruno Ramos, Antonio Carlos S. C. Teixeira, Douglas Gouvea
Summary: This research synthesized TiO2 microspheres using ultrasonic spray pyrolysis, which allowed for continuous production of TiO2 nanocrystals and promoted phase stability and limited particle coarsening. The synthesized porous anatase TiO2 microspheres exhibited superior photocatalytic activity, surpassing the commercial standard TiO2 P25 by approximately 60%.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Tingting Wang, Bingguo Xue, Hao Cui, Yingying Zhang, Manmen Liu, Jialin Chen, Ming Wen, Wei Wang, Xudong Sun, Shaohong Liu
Summary: LuAG:Ce is an important color converter in the white lighting industry, with LuAG:Ce film offering advantages such as efficient heat dissipation and rare earth conservation. The preparation process and photoluminescence performance of LuAG:Ce film were investigated, showing that increasing Ce3+ doping concentration enhanced the emission intensity. By coupling Ce3+ doped LuAG:Ce film with a blue laser, white light emission was successfully achieved.
Article
Materials Science, Multidisciplinary
Ali Akbar Hussaini, Mehmet Okan Erdal, Kemal Dogan, Mustafa Koyuncu, Murat Yildirim
Summary: In recent years, there has been increasing focus on the photodiode properties of MS devices in order to enhance the performance of light sensing devices. In this study, LiCoO2 thin film was synthesized through a sol-gel-based electrospinning method and used as an interlayer for fabricating Al/LiCoO2/n-Si photodiode. The characterization results showed that the LiCoO2 thin film had a crystallite size of 37.75 nm. Electrical characterization using current-voltage and current-transient measurements demonstrated that the Al/LiCoO2/n-Si photodiode exhibited good behavior and a high rectifying ratio, with significant responsivity and detectivity. These findings suggest that LiCoO2-based devices can be utilized in optoelectronic applications.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Asha Hind, Parutagouda Shankaragouda Patil, Neelamma B. Gummagol, B. V. Rajendra
Summary: Annealing treatment enhanced the crystallinity and transparency of Sn0.97La0.03O2 films, while reducing the defect density. It has a significant impact on the nonlinear optical and electrical properties of the films.
Article
Materials Science, Multidisciplinary
Rongxin Liu, Yang Ren, Huimin Cai, Cheng Zhang, Jinmei Wang, Gaoyang Zhao, Shengguo Zhang
Summary: In this study, Nb-doped TiO2 (NTO) films were fabricated on ITO glass substrates using the ultrasonic spray pyrolysis (USP) method. The effects of deposition temperature and film thickness on the microstructure and electrochromic property of NTO films were investigated. The results showed that increasing the deposition temperature improved the crystallinity and electrochromic properties of the films, while the growth direction and surface morphology of the NTO grains were strongly influenced by the film thickness. The NTO films with a thickness of 300 nm and sheet-structured grains exhibited optimal properties, allowing precise independent spectral control over material transmittance in the visible and near-infrared regions.
Article
Chemistry, Physical
Metwally Madkour
Summary: In this study, CuxO thin films were successfully prepared using ultrasonic spray pyrolysis with a single coordinated organic source as the precursor. Various operational parameters were investigated, and the precursor and thin films were characterized using multiple techniques. By optimizing the deposition temperature, different compositions of CuxO thin films were obtained, and a heterostructured photocatalyst of CuO/Cu2O thin film exhibited enhanced photocatalytic activity with low recombination rates and improved charge assembly.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2021)
Article
Materials Science, Ceramics
Outman El Khouja, Ilhame Assahsahi, Khalid Nouneh, Mohamed Ebn Touhami, Mihail Secu, Abdelali Talbi, Yassine Khaaissa, Elena Matei, Viorica Stancu, Andrei Galatanu, Aurelian Catalin Galca
Summary: This study investigates the fabrication of stannite Cu2CoSnS4 (CCTS) films using the spray pyrolysis method and explores the influence of deposition and sulfurization temperatures on their structure and properties.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Analytical
Soichiro Torai, Taro Ueda, Kai Kamada, Takeo Hyodo, Yasuhiro Shimizu
Summary: Porous (pr-)SnO2-based powders were synthesized using ultrasonic spray pyrolysis with home-made polymethylmethacrylate (PMMA) microspheres as templates. The addition of CuxO to the pr-SnO2 powder improved its sensing properties for acetone and toluene. The 0.8 wt% Cu-added pr-SnO2 sensor showed the highest acetone response at 350 degrees C. The addition of CuxO decreased the concentration of carrier electrons and the acetone-oxidation activity, leading to the improvement of the acetone-sensing properties of the pr-SnO2 sensor.
Article
Chemistry, Analytical
Sunita Bishnoi, Ashutosh Sharma, Rahul Singhal, Pankaj Gupta, Rajendra N. Goyal
Summary: In view of the increase in breast cancer cases, a new electrochemical sensing method for detecting the carcinogenic pesticide chlorpyrifos in breast milk has been proposed. The method offers high sensitivity, stability, and is useful for cancer hospitals, pesticide industries, and environmental toxicity-related studies.
Article
Materials Science, Ceramics
Arvind Kumar, Ashwani Kumar, Shekhar Tyagi, Ramesh Chandra, Davinder Kaur
Summary: This study investigates the in-situ growth of nanoflakes structure in Bi0.9La0.1Fe0.5Mn0.5O3 (BLFMO) thin films. The study demonstrates that the use of a LNO buffer layer allows for controlled growth of BLFMO thin films with a specific crystal structure. The compact and densely packed nanoflake structures in the BLFMO thin film samples are confirmed by surface morphological investigations. The study also explores the leakage current behavior and tunability of BLFMO thin films, presenting valuable insights for the fabrication of thin film based ferroelectric memory devices.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Aditya Yadav, Anuj Sharma, Vishal Baloria, Preetam Singh, Govind Gupta
Summary: This study reports the growth of nanostructured tungsten oxide (WO3) thin film on SiO2 substrate under controlled oxidation conditions for NO sensing. The fabricated sensor demonstrates high selectivity, stability, and faster response/recovery time, with an ultra-high response for 1 ppm NO concentration at 250 degrees C. The ultra-high response is attributed to the high specific surface area and effective gas diffusion ability of the sensor.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Kumar Kaushlendra, Pradeep Kumar, Diksha Arora, Bhanu Ranjan, Davinder Kaur
Summary: This article presents a Cu/MoS2/NiMnIn memory structure for flexible electronics, and investigates the resistive switching characteristics. Two different devices were fabricated, one without sulfur vacancies and one with sulfur vacancies in the MoS2 thin film. The memory structure showed stable resistive switching behavior, good endurance cycles and data retention capability. Furthermore, the external temperature and magnetic field were found to affect the SET voltage and enhance the data storage capability of the device.
CERAMICS INTERNATIONAL
(2023)
Article
Energy & Fuels
Krishan Kumar, Reena Yadav, Sarita Devi, Preetam Singh, Sudhir Husale, Sachin Tyagi, Davinder Kaur
Summary: The present study proposes two effective routes to enhance the response time and detection range of the n-MoS2/p-CuO heterojunction. Firstly, by inserting an insulating AlN layer between MoS2 and CuO, the traditional p-n junction transforms into a Semiconductor-Insulator-Semiconductor (SIS) structure, achieving superior carrier tunneling mechanism. Secondly, the detection range is extended to the UV region by adding MoS2 quantum dots (QDs) on the surface of MoS2 layer. The results demonstrate that the n-MoS2/AlN/p-CuO (SIS) heterojunction with MoS2 QDs has great potential for next-generation ultrafast optoelectronics applications.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Physics, Condensed Matter
Debashrita Mahana, Amit Kumar Mauraya, Preetam Singh, Senthil Kumar Muthusamy
Summary: Understanding the conversion process of Cu thin films into copper oxide is important for environmental stability and preparation of copper oxide thin films. This study investigates the evolution of copper oxides through thermal oxidation of Cu films deposited using different processes. The oxidation of deposited films results in the complete conversion of Cu to Cu2O at 300°C and Cu2O to CuO at 400°C. The CuO films exhibit an optical band gap of approximately 1.8 eV. It is observed that sputtered Cu films oxidize faster than evaporated films.
SOLID STATE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Pargam Vashishtha, Pukhraj Prajapat, Anuj Sharma, Preetam Singh, Sumeet Walia, Govind Gupta
Summary: This study introduces a unique coco palm-like MoS2/GaN heterojunction-based self-powered photodetector that operates in the broadband spectral range and exhibits high responsivity at both room temperature and high operating temperatures. The device also has low-light detection abilities and opens up possibilities for monitoring optical radiations in various industrial processes.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Physics, Applied
Pradeep Kumar, Akhilesh Pandey, Shankar Dutta, Davinder Kaur
Summary: Functional flexible piezo-resonators have been developed for designing high-frequency wearable devices. It was found that resonators fabricated over magnetostrictive substrates have higher tunability and sensitivity.
APPLIED PHYSICS LETTERS
(2023)
Article
Physics, Applied
Diksha Arora, Pradeep Kumar, Shalini Singh, Ankur Goswami, Davinder Kaur
Summary: This article reports on a new type of flexible multiferroic heterostructure with enhanced magnetoelectric (ME) effect and zero-biased ME effect. This heterostructure is flexible, cost-effective, temperature-sensitive, and exhibits significant ME output. It has promising technological developments in wearable magnetic field sensing, nonvolatile memory, soft robotics, and portable energy harvesters.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Stuti Srivastava, Charu Dwivedi, Aditya Yadav, Ashwani Kumar, Govind Gupta, Preetam Singh
Summary: This study presents the H2S gas sensing results of Pd-decorated NiO thin films. The results show that Pd catalyst enhances the sensing capability of NiO films towards H2S gas, with high response, low optimum operating temperature, fast response/recovery time, low detection concentration, good stability, and high selectivity.
Article
Materials Science, Multidisciplinary
Stuti Srivastava, Amit Kumar Gangwar, Ashwani Kumar, Govind Gupta, Preetam Singh
Summary: We investigated the H2S gas sensing performance of nanocrystalline NiO thin films sputtered on an alumina substrate by RF magnetron sputtering. The films exhibited a granular morphology and hydrophobic nature (-123.5 degrees contact angle). Oxygen or nickel vacancies/defects were observed based on the PL spectrum and confirmed by XPS measurements. The NiO thin films showed high sensitivity, selectivity, and stability towards H2S gas, with a detection limit of 135 ppb and a maximum sensor response (Rg/Ra) of -28.8 for 200 ppm H2S gas at 400 degrees C.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Energy & Fuels
Shweta Tomer, Meenakshi Devi, Abhishek Kumar, Shubha Laxmi, Subhashree Satapathy, Kamlesh Kumar Maurya, Preetam Singh, Prathap Pathi, Vandana
Summary: Excellent silicon surface passivation is achieved by atomic layer deposition (ALD) grown hafnium oxide (HfOx) films on silicon surfaces (both n-type and p-type). The study suggests that the film thickness of the HfOx thin films plays a crucial role in the silicon surface passivation, with a minimum thickness of approximately 2 nm required for effective passivation. The best results are obtained for hydrogen-annealed, similar to 8.5-nm-thin HfOx films, which achieve a low surface recombination velocity (SRV) and high effective minority carrier lifetime (tau(eff)).
IEEE JOURNAL OF PHOTOVOLTAICS
(2023)
Article
Physics, Condensed Matter
Rahul Godiwal, Amit Kumar Gangwar, Ajay Kumar Verma, Pargam Vashishtha, Ashwani Kumar, Vipin Chawla, Govind Gupta, Preetam Singh
Summary: We report on the efficient CO gas sensing application of single-step grown ZnO nanocandles without adding any catalyst. A simple, scalable, and cost-effective thermal evaporation technique was employed for the growth of ZnO nanostructures on alumina substrate at 600 degrees C. The shape and size of the ZnO nanostructures were strongly influenced by the oxygen ambient. The CO gas sensing performance of the synthesized samples was analyzed, and the nanocandles showed the highest sensor response and shortest response/recovery time.
MICRO AND NANOSTRUCTURES
(2023)
Article
Physics, Condensed Matter
Stuti Srivastava, Amit Kumar Gangwar, Ashwani Kumar, Govind Gupta, Preetam Singh
Summary: In this study, room temperature reactive magnetron sputtered NiO thin films were prepared to detect H2S gas. The influence of O2/Ar gas ratio on the sensing performance was investigated, and it was found that the NiO film prepared at 20% O2/Ar ratio exhibited highly improved response rate and response time, showing potential for low ppm H2S gas detection.
MICRO AND NANOSTRUCTURES
(2023)
Article
Materials Science, Multidisciplinary
Animesh Pandey, Sanjay Sharma, Amit Kumar Gangwar, Mandeep Kaur, Preetam Singh, Sudhir Husale
Summary: This study reports the fabrication of a flexible NIR photodetector using Bi2Te3 thin film and investigates the strain effects on the photocurrent. The results show that these flexible devices exhibit high stability and ultra-high photoresponsivity under various bending conditions.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
