Article
Engineering, Electrical & Electronic
K. Sri Varshini, Kampara Roopa Kishore, B. G. Jeyaprakash, D. Balamurugan
Summary: Heterostructured ZnO/Fe2O3 nanofibers were prepared using electrospinning method. The resulting nanofibers showed uniform distribution and were calcinated at 450 degrees C to obtain polycrystalline ZnO/Fe2O3 with an average grain diameter of 21 nm. The X-ray diffraction and X-ray photoelectron spectroscopy studies confirmed the composition and nature of the nanograins. The prepared ZnO/Fe2O3 nanograins exhibited a quick response and recovery towards formaldehyde vapor.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Physical
Zhenyu Yuan, Jinquan Li, Fanli Meng
Summary: Co@ZnO nanorods with co-modification were successfully prepared by hydrothermal synthesis method without secondary pollution. The gas sensing tests show that the Co@ZnO sensor has a significant improvement in detecting n-propanol with faster response time and lower detection limit.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Pierre G. Ramos, Juan Espinoza, Luis A. Sanchez, Juan Rodriguez
Summary: This study investigates the use of transition metal-doped zinc oxide/reduced graphene oxide (ZnO/rGO) nanostructures for photocatalytic applications. A cost-effective electrospinning-assisted hydrothermal method is proposed to synthesize these nanostructures. The results show that the doping of transition metals and the presence of rGO improve the photocatalytic activity of ZnO, by enhancing the separation of photogenerated electron-hole pairs and inhibiting their recombination. Despite challenges in controlling the doping process, transition metal-doped ZnO/rGO nanostructures show promise for efficient and sustainable photocatalytic applications in the future.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Engineering, Electrical & Electronic
Xiaojuan Jin, Yilin Yan, Lecheng Tian, Jiaqi Zhang
Summary: Nitrogen oxides are harmful gases that are toxic to human health. The study shows that the ZnO nanorods array film can effectively detect and sense NOx, and it has a good linear relationship and sensitivity within the range of 0.1-3 ppm.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Rajwali Khan, Ihab Shigidi, Sattam Al Otaibi, Khaled Althubeiti, Sherzod Shukhratovich Abdullaev, Nasir Rahman, Mohammad Sohail, Alamzeb Khan, Shahid Iqbal, Tommaso Del Rosso, Quaid Zaman, Aurangzeb Khan
Summary: In this study, the co-precipitation approach was used to synthesize ZnO, Zn0.96Gd0.04O, and Zn0.96-xGd0.04CoxO nanotubes. The effects of gadolinium and cobalt doping on the microstructure, morphology, and optical characteristics of ZnO were investigated. It was found that gadolinium and cobalt doping did not affect the morphology of the nanotubes, but reduced the crystallinity of the samples. The doping also resulted in changes in the optical characteristics and electrical conductivity of the nanotubes.
Article
Engineering, Electrical & Electronic
Ahmad Kamalianfar
Summary: Root-like ZnO microstructures were synthesized using a chemical method with the deposition of Ag nanoparticles. The gas-sensing characteristics were investigated by varying the annealing time. Williamson-Hall analysis revealed that the crystallite size increased from 5.3 nm to 63.3 nm with increasing annealing time. The presence of nanowires on the roots improved conduction and intensified gas-adsorption phenomena, resulting in an excellent gas-sensing performance of the Ag/ZnO sensor towards ethanol.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Seung-Eun Baek, Dahl-Young Khang
Summary: Selective growth of ZnO nanorods has been achieved by exploiting the thickness contrast and grain size variation in the IZO QD seed layer, leading to improved sensor performance.
Article
Chemistry, Physical
Wei Yang, Xiao Xiao, Baijun Fang, Hexia Deng
Summary: In this study, a single-crystalline nanorods-built ZnO microflower was prepared through a simple hydrothermal method, and its surface morphology, crystal structure, element composition, and pore characteristic were characterized using various techniques. The ZnO microflower-based gas sensor showed remarkable response towards n-butanol with outstanding selectivity, low detection limit, and rapid response rate. The integration of 1D nanorods into a rational 3D structure was found to be an efficient strategy for fabricating high-performance gas sensors.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Sameerah I. Al-Saeedi
Summary: This study compares the effects of different nanostructured ZnO photoelectrodes on structural, optical, and PEC hydrogen production efficiency, as well as electrode stability. The results show that hexagonal nanorod array morphology offers low-cost, high-quality PEC performance and durability.
Article
Engineering, Electrical & Electronic
V. S. Kamble, Y. H. Navale, V. B. Patil, N. K. Desai, S. N. Vajekar, S. T. Salunkhe
Summary: Pristine and Co-doped ZnO nanocapsules were successfully prepared using a cost-effective method, and the 3% Co-doped ZnO sensor exhibited the highest gas response to NO2 with fast response/recovery time and stability towards 100 ppm concentration at 200 degrees C.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Chemistry, Physical
Shengnan Lu, Houhong Song, Yonghou Xiao, Kamran Qadir, Yanqiang Li, Yushan Li, Gaohong He
Summary: Tuning the fraction of exposed polar and non-polar crystal facets in ZnO is an effective strategy to tailor metal-oxide interfacial active sites. CuO/ZnO catalyst derived from ZnO nanodisks with the most exposed (002) polar plane exhibited more than 2 folds higher catalytic activity than that over CuO/ZnO with commercial ZnO support (CuO/ZnO-C) at 150 degrees C, highlighting the morphology influence of ZnO.
COLLOID AND INTERFACE SCIENCE COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Cong Qin, Bing Wang, Pengpeng Li, Lian Sun, Cheng Han, Nan Wu, Yingde Wang
Summary: Metal oxide-based CO sensors with ppb-level detection limit are highly desirable, and a regular approach for synthesizing highly dispersed Pt nanoparticles-functionalized ZnO polyhedrons using metal-organic framework as a template is reported. The prepared sensor exhibited good CO response, long-term stability, ultra-low detection limit, and superior CO selectivity, showing great potential for detecting low-concentration CO.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Hui Yang, Ming-Mei Zhao, Lan Li, Le-Xi Zhang
Summary: ZnO nanomaterials have been widely used for gas sensors due to their structural flexibility, earth abundance, and environmental friendliness. This study found that ZnO nanorods with a high amount of doubly positively charged oxygen vacancies showed superior gas sensitivity towards xylene, while Ga doping reduced the number of these vacancies and resulted in worse sensing performance. Therefore, doubly positively charged oxygen vacancies play a crucial role in the gas sensing performance of metal-oxide semiconductors.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Lianyun Cheng, Yanwei Li, Guang Sun, Jianliang Cao, Yan Wang
Summary: Driven by environmental degradation, the gas sensor constructed with metal oxide semi-conductor (MOS) has rapidly developed due to its suitability for monitoring different hazardous gases. This paper presents a CdS-ZnO n-n heterojunction approach to enhance the sensing performance of ZnO for triethylamine (TEA). Compared to the pure ZnO sensor, the hybrid CdS/ZnO sensor exhibits significant improvements in TEA sensing performance, including lower operating temperature (reduced from 200 to 160 degrees C), higher sensitivity (0.214/ppm vs 0.068/ppm to 1-200 ppm TEA), better selectivity, and faster response speed.
Article
Chemistry, Physical
H. J. Yashwanth, Sachin R. Rondiya, Henry I. Eya, Nelson Z. Dzade, Deodatta M. Phase, Sanjay D. Dhole, K. Hareesh
Summary: We developed a facile synthesis method to prepare nitrogen and phosphorus co-doped carbon quantum dots (NPCQDs) anchored on ZnO nanorods, forming NPCQDs/ZnO (NPCZ) nanohybrid photocatalysts for efficient light-driven hydrogen production. The NPCZ catalyst showed an enhanced hydrogen production rate of 417 μmol/h·g under visible light compared to other photocatalysts. The synergistic interactions between the NPCQDs and ZnO nanorods resulted in the formation of additional energy levels, reduced recombination rate, increased decay lifetime of electron-hole pairs, and improved hydrogen generation performance in the visible region. The experimental results were further supported by Density Functional Theory (DFT), which confirmed the decrease in bandgap and work function as well as the improvement in density of states (DOS) of the NPCZ photocatalyst. (c) 2022 Elsevier B.V. All rights reserved.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Instruments & Instrumentation
Hala J. El-Khozondar, Waleed S. Mohammed
Article
Nanoscience & Nanotechnology
Sunil Deka, Waleed Mohammed
JOURNAL OF NANOPHOTONICS
(2020)
Article
Optics
Hironmay Deb, Nantarat Srisuai, Romuald Jolivot, Chamras Promptmas, Waleed S. Mohammed, Sakookan Boonruang
OPTICS AND LASER TECHNOLOGY
(2020)
Article
Optics
Kunal Sharma, Tanujjal Bora, Waleed S. Mohammed
Summary: Methacrylate-based photopolymer waveguides are 3D printed using stereolithography as a single-step fabrication technique, and the optical power transmission through the waveguides is significantly affected by solvent absorption and swelling. Isopropanol samples show a higher optical power enhancement compared to glycerol samples, with a first-order optical model revealing the importance of the absorption affinity of the solvent towards the photopolymer.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Kankan Swargiary, Romuald Jolivot, Waleed Soliman Mohammed
Summary: A polymer-based horizontal single-step waveguide for alcohol sensing was developed and analyzed using 3D printing DLP technology. The waveguide structure is designed for maximum light confinement at the core and utilizes the interaction between polymer and alcohol for detection. By comparing different waveguide gap sizes, it was found that a gap size of 300 μm showed the highest increase in transmitted optical power when tested with isopropanol alcohol concentration of 500 ppm.
Article
Nanoscience & Nanotechnology
Chathurika Maduwanthi, Chao-An Jong, Poompat Saengudomlert, Karel Sterckx, Waleed S. Mohammed, Shu-Han Hsu
Summary: This research presents a method to enhance fluorescence detection by integrating a lens and nanoparticles into a cuvette. The customized cuvette demonstrated significant signal enhancement in fluorescence detection at a sub-microliter scale.
MICRO & NANO LETTERS
(2022)
Article
Engineering, Multidisciplinary
Hoorieh Fallah, Tannaz Asadishad, Gholam M. Parsanasab, Sulaiman Wadi Harun, Waleed S. Mohammed, Moh Yasin
Summary: This study introduces a fiber optic biosensor based on ZnO nanorods for rapid and sensitive detection of E. coli, showing potential for monitoring water and food quality for various pathogenic microorganisms.
ENGINEERING JOURNAL-THAILAND
(2021)
Article
Chemistry, Analytical
Kankan Swargiary, Prattakorn Metem, Chayapol Kulatumyotin, Suphavit Thaneerat, Noppasin Ajchareeyasoontorn, Pannathorn Jitpratak, Tanujjal Bora, Waleed S. Mohammed, Joydeep Dutta, Charusluk Viphavakit
Summary: This study demonstrated a zinc oxide-coated optical fiber sensor for detecting the volatile organic compound biomarker isopropanol (IPA) for diabetes. By optimizing the length of the sensing region and surface functionalization, a sensor with enhanced sensitivity was successfully fabricated. The sensor has the potential to effectively detect isopropanol.
Proceedings Paper
Optics
Kunal Sharma, Waleed S. Mohammed, Tanujjal Bora
Summary: A theoretical model is used to study the dynamic gain in transmitted optical power through a 3D printed photopolymer waveguide, and experimental results are compared for validation. This research provides valuable insights for fabricating integrated optical devices for sensing applications using photopolymers.
OPTICAL TECHNOLOGY AND MEASUREMENT FOR INDUSTRIAL APPLICATIONS CONFERENCE 2021
(2021)
Proceedings Paper
Engineering, Biomedical
Prattakorn Metem, Wisarn Patchoo, Waleed S. Mohammed, Charusluk Viphavakit
Summary: This paper introduces a numerical modelling for investigating the characteristics of a surface functionalised optical fibre sensor to detect VOCs biomarkers. A coreless silica fibre connected to single-mode fibre is proposed for detecting VOCs biomarkers for diabetes. Sensing region undergoes surface functionalisation with Au-silane for selective detection, achieving higher sensitivity compared to unfunctionalised sensor.
OPTICAL FIBERS AND SENSORS FOR MEDICAL DIAGNOSTICS, TREATMENT AND ENVIRONMENTAL APPLICATIONS XXI
(2021)
Article
Engineering, Multidisciplinary
Hironmay Deb, Nantarat Srisuai, Sakoolkan Bonruang, Romuald Jolivot, Chamras Promptmas, Waleed S. Mohammed
Summary: This paper presents a design and development of an open-source platform-based reflection spectroscopy readout system for GMR sensing applications. By optimizing the GMR dimensions and imaging system, the angular resolution is enhanced while sustaining resonance excitation. Utilizing 3D printing for mechanical mounting ensures compactness and portability of the system. The system performance is tested by measuring changes in the refractive index of the environment at the GMR chip interface.
ENGINEERING JOURNAL-THAILAND
(2021)
Proceedings Paper
Automation & Control Systems
Kawintida Santavanond, Charusluk Viphavakit, Wisarn Patchoo, Hala El-Khozondar, Waleed Mohammed
Summary: This study aims to design and develop a LSPR enhanced gold colloidal nanoparticles sensor for biomedical applications, specifically for detecting glucose levels.
2021 SECOND INTERNATIONAL SYMPOSIUM ON INSTRUMENTATION, CONTROL, ARTIFICIAL INTELLIGENCE, AND ROBOTICS (ICA-SYMP)
(2021)
Article
Engineering, Multidisciplinary
Eidi Mohammad Atif, Nitiwit Dumrichob, Romuald Jolivot, Karel Sterckx, Waleed S. Mohammed
ENGINEERING JOURNAL-THAILAND
(2020)
Article
Engineering, Multidisciplinary
Sunil Deka, Waleed Mohammed
ENGINEERING JOURNAL-THAILAND
(2020)
Article
Optics
Hang Dong, Zhixin Sun, Jingyi Li, Yahui Li, Wei Zhang, Guangyong Jin
Summary: This paper calculates thermal stresses and adsorption forces to determine laser cleaning conditions and establishes relevant models. Experimental results show that the removal effect is better with increasing nanosecond pulse delay, with the best effect achieved at 600 milliseconds pulse delay. Based on the findings, the mechanisms of oxide film removal involve thermal stress against adsorption and plasma shock wave breaking the oxide layer.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Junjie Zhang, Wenjun Li, Bingtao Li, Zheng-Da Hu, Jicheng Wang, Feng Zhang, Lei Wang
Summary: A multilayer thin film device structure based on Tamm plasmons is proposed for high-performance near-infrared hot electron photodetectors. By optimizing the device structure parameters, high responsivity detection can be achieved.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hong Huang, Zhiguang Han
Summary: This paper proposes a new ghost imaging reconstruction method using ordered orthogonal Hadamard derived speckle as the illumination speckle series, and introduces the alternating direction multiplier method to improve the imaging performance. The evaluation results show that the method can achieve high-quality reconstructed images under low sampling conditions.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Moritsugu Sakamoto, Yuki Ono, Kohei Noda, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Masayuki Tanaka, Hiroshi Ono
Summary: The effect of wavelength and polarization of illuminating light in polarization imaging for birefringent objects placed behind a scattering structure was experimentally investigated. The result shows that the spatial distribution of the birefringent object was more clearly visualized in the longer wavelength combined with circularly polarized light illumination. This finding indicates the potential of using polarization imaging with circularly polarized light illumination in the near-infrared range for visualizing birefringent objects with scattering.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Peihui Du, Hongfang Wang, Pengwei Li, Rukeyemuhan Abadula, Hmbat Batelbek, Min Gao
Summary: In this study, we theoretically demonstrate the strong coupling between Tamm plasmons and exciton polaritons in metal Al/DBR-molecular structures, extending the operating wavelength to the deep ultraviolet region. The coupling strength can be effectively manipulated by adjusting the structure parameters, offering potential benefits for the development of new-style optical filters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Priyanka Chaudhary, Akhilesh Kumar Mishra
Summary: We design and numerically investigate the switching dynamics between two outer waveguides in a parity-time (PT)-symmetric adiabatically coupled three waveguides nonlinear directional coupler (NLDC) system. The study shows that the device can provide switching even when the middle waveguide is nonlinear and the outer waveguides are linear. Furthermore, the effect of loss to gain ratio on critical switching power and the impact of launched light power and gain (loss) value on transmitted power are also studied.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Wei Feng, Yongcong Yi, Shuyang Li, Zhi Xiong, Boya Xie, Zhen Zeng
Summary: Traditional imaging techniques are ineffective in achieving clear underwater imaging due to the presence of scattering media. Single-pixel imaging (SPI) system based on Unet++ offers a solution for reconstructing high-quality images in highly turbid water environments.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiaorui Qu, Jufeng Zhao, Haijun Tian, Junjie Zhu, Guangmang Cui
Summary: This paper studies the structural similarity between RGB and spectral images and proposes a non-iterative Images Structure Similarity (ISS) method for fast reconstruction of spectral images. Additionally, the input of the Deep Image Prior (DIP) method is optimized for the first time by using the initial spectral data reconstructed by ISS, leading to an improved starting value for the iteration. The experimental results show that the proposed method can enhance the reconstruction quality in both spectral and spatial resolutions, while significantly reducing the reconstruction time compared to other DIP-based methods.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Donghe Sheng, Zhe Han, Zanyang Qiao, Tianpei Dong, Chenxi Wang, Huiping Tian
Summary: In this study, a distributed multi-parameter sensor based on an etched few-mode multi-core fiber is proposed, allowing simultaneous sensing of temperature, strain, and sample refractive index. By combining space division multiplexing and stimulated Brillouin scattering, the sensor achieves high sensitivity in detecting these parameters.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Dehao Chen, Zhenwu Mo, Zehong Liang, Junjie Jiang, Huilin Tang, Yidan Sun, Ziyu Wang, Quanfeng Wei, Yanru Chen, Dongmei Deng
Summary: In this study, a novel family of elliptical Airyprime vortex beams (EAPVBs) is introduced, which inherits the excellent self-focusing properties of the circular Airyprime vortex beam (CAPVB). The asymmetric focusing of EAPVB leads to some novel properties, such as the splitting of high-order optical vortex and the formation of two foci. By taking advantage of these properties, EAPVB is constructed as a tunable optical bottle for particle capture.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Xiao Ma, Qiongchan Shao, Jian-Jun He
Summary: In this study, an SHS chip based on Su8 waveguide was designed and fabricated. By physically adjusting the metal electrodes and compensating for transmissivity fluctuations, the generation of side ripples was successfully suppressed.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Hongbin Zhang, Jiansen Du, Zongtao Chi, Hailin Cong, Bin Wang
Summary: In this paper, a novel type of dual-wavelength confocal metalens is proposed to solve the spatial crosstalk between two wavelengths. The metalens can greatly reduce the spatial crosstalk and achieve high precision and efficiency in confocal imaging. It can also focus light in specific wavelength ranges, making it suitable for imaging, microscopy, and optical fiber communication.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Rui Qiu, Guanmao Zhang, Shaokai Du, Jie Liu, Hongyu Jib, Kaiyun Bi, Bochuan Xing, Guangchao Diao
Summary: Recent research has developed an achromatic metalens that shows potential for replacing traditional lenses. This study focuses on a continuously variable focus height broadband achromatic metalens for long-wavelength infrared applications. By optimizing materials and parameters, chromatic aberration is effectively corrected, making it suitable for high-resolution LWIR imaging and spectroscopy systems.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Marcos Troncoso-Costas, Gaurav Jain, Yiming Li, Mohammed Patel, Lakshmi Narayanan Venkatasubramani, Sean O'Duill, Frank Smyth, Andrew Ellis, Francisco Diaz-Otero, Colm Browning, Liam Barry
Summary: In this work, a fast-switching tuneable laser capable of wide wavelength coverage, low noise and linewidth levels suitable for high-order modulation formats is demonstrated. The laser is characterized to cover a wavelength range of 35 nm in the C-band with nanosecond switching time. It is used to successfully demonstrate 480 Gbit/s 16QAM transmission over 25 km of single-mode fiber for a wavelength range of 19 nm.
OPTICS COMMUNICATIONS
(2024)
Article
Optics
Takeshi Moriyasu, Masahiko Tani, Hideaki Kitahara, Takashi Furuya, Jessica Afalla, Toshiro Kohmoto, Daishiro Koide, Hiroki Sato, Mitsutaka Kumakura
Summary: Optical pump-terahertz probe spectroscopy was used to study the photocarrier dynamics and optical characteristics of semiconductor Si. The results showed that the thickness of Si influenced the transmitted terahertz field amplitude and peak delay time, indicating differences in photocarrier dynamics between different Si materials.
OPTICS COMMUNICATIONS
(2024)