Article
Optics
Mohd Hafiz Jali, Hazli Rafis Abdul Rahim, Md Ashadi Md Johari, Aminah Ahmad, Haziezol Helmi Mohd Yusof, Siti Halma Johari, Mohamad Faizal Baharom, Siddharth Thokchom, Kaharudin Dimyati, Sulaiman Wadi Harun
Summary: A humidity sensor is proposed by integrating a microsphere resonator onto a glass surface coated with ZnO nanorods, showing high sensitivity and resolution. The sensor enhances the interaction with the surrounding medium by utilizing the high Q factor of the microsphere and the changeable refractive index of the ZnO nanorods. It effectively solves the issues related to complicated handling of microfibers during the coating process.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Sheng-Joue Young, L. T. Lai
Summary: In this study, pure ZnO and Au nanoparticle-modified ZnO nanorods were prepared on a glass substrate through the hydrothermal method and used to fabricate humidity sensors. Analysis of crystal and optical properties showed that the ANM ZnO nanorods had better humidity sensing performance compared to pure ZnO nanorods. The results demonstrated that Au nanoparticle adsorption effectively improved the humidity sensing properties.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Optics
Mohd Hafiz Jali, Hazli Rafis Abdul Rahim, Md Ashadi Md Johari, Haziezol Helmi Mohd Yusof, Aminah Ahmad, Siddharth Thokchom, Kaharudin Dimyati, Sulaiman Wadi Harun
Summary: This paper presents a novel humidity sensor fabricated by integrating microfiber and glass surface coated with ZnO nanorods. The sensor shows significant response to humidity levels ranging from 35%RH to 85%RH, with improved sensitivity and resolution compared to uncoated glass substrate. The proposed sensor effectively utilizes the interaction between ZnO nanorods and the microfiber's evanescent field, demonstrating excellent sensing performance.
Article
Polymer Science
Wang-De Lin, You-Chen Lin, Ren-Jang Wu, Murthy Chavali
Summary: This study presents a novel humidity sensor based on a nanocomposite material of graphene and zinc oxide, with the 70% graphene content showing high sensitivity and rapid response, indicating great potential for monitoring atmospheric humidity. The research also discusses the mechanism behind the effects of humidity on the nanocomposite material.
Article
Optics
Siti Halma Johari, Tiu Zian Cheak, Hazli Rafis Abdul Rahim, Mohd Hafiz Jali, Haziezol Helmi Mohd Yusof, Md Ashadi Md Johari, Moh Yasin, Sulaiman Wadi Harun
Summary: A relative humidity sensor using a plastic optical fiber coated with zinc oxide nanorods was fabricated, showing improved sensitivity and resolution compared to conventional sensors. The sensor exhibited excellent repeatability properties and demonstrated high performance as an RH sensor.
Article
Chemistry, Physical
Xiu-Juan Xie, Ren-Jun Si, Jun Zheng, Kai Wei, Xiu-Ying Zheng, Cheng Chen, Chun-Chang Wang
Summary: ZnO/NiO hollow spheres were successfully prepared with good purity and crystallinity, showing enhanced humidity response compared to pure materials. The sensor achieved a large impedance variation and fast response/recovery time, demonstrating promising potential for advanced humidity sensor applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Analytical
Jinyu Huang, Dongting Jiang, Jiaxi Zhou, Jiexiong Ye, Yiling Sun, Xuejin Li, Youfu Geng, Jiaqi Wang, Yu Du, Zhengfang Qian
Summary: This study synthesized CuPc-loaded ZnO nanorods using a one-step microwave-assisted hydrothermal approach and characterized the products using various techniques. The CuPc/ZnO sensor showed excellent sensitivity and selectivity towards ammonia under light illumination, with a low detection limit of 0.8 ppm under red light.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
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
Chemistry, Physical
Han Liu, Jiawei Kong, Zhe Dong, Yongmei Zhao, Baoli An, Junping Dong, Jiaqiang Xu, Xiaohong Wang
Summary: We have developed a highly sensitive H2S gas sensor based on a micro-electro-mechanical system (MEMS) with a ppb level detection limit (as low as 5 ppb). The sensor utilizes ZnO/Co3O4 sensing materials derived from Zn/Co-MOFs through annealing at 500°C. The ZnO/Co3O4-500 sensor shows the highest response when exposed to 10 ppb H2S gas at 120°C, and it exhibits excellent selectivity, long-term stability, and moisture resistance due to its unique morphology and properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Analytical
Peng Li, Shuguo Yu, Hongyan Zhang
Summary: The use of silver-modified zinc oxide in humidity sensors can significantly enhance performance, with better response, linearity, and recovery time, while being minimally affected by light.
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
Materials Science, Multidisciplinary
Sanjaya Brahma, P. C. Huang, B. W. Mwakikunga, V. Saasa, A. A. Akande, Jow-Lay Huang, Chuan-Pu Liu
Summary: This study demonstrates the gas sensing properties of Cd-doped ZnO nanorods at room temperature and low temperature. The Cd doping in ZnO nanorods enhances the overall sensitivity to NH3 gas, with the highest sensitivity observed at a Cd doping concentration of 0.5 at %. The sensitivity continues to increase with the increase of temperature, indicating a significant enhancement of gas sensing performance at high temperature. Cd-doped ZnO nanorods also exhibit superior specificity for detecting NH3 over other gases such as NO2 and H2S at room temperature.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
M. Sinha, S. Neogi, R. Ghosh
Summary: The operating temperature is an important factor in controlling the selectivity of a chemiresistive type sensor for gas/vapor detection. By regulating the temperature dependent adsorption/desorption process, the selectivity of the sensor can be switched between different target gases, making it suitable for practical applications. In this study, a high performance, low temperature, and versatile VOC sensor was developed using hydrothermally synthesized ZnO nanorod networks. The selectivity of the sensor prototype was successfully switched from methanol to formaldehyde by adjusting the operating temperature. The sensor exhibited high sensitivity, selectivity, repeatability, and a low response time, making it a reliable VOC sensor for practical applications.
SENSORS AND ACTUATORS A-PHYSICAL
(2023)
Article
Engineering, Electrical & Electronic
Onur Alev, Imren Erguen, Okan Oezdemir, Leyla Colakerol Arslan, Serkan Bueyuekkoese, Zafer Ziya Ozturk
Summary: Cu-doped ZnO nanorods showed enhanced sensor response towards ethanol and allowed operation at lower temperatures compared to pristine ZnO nanorods, with 2% and 3% Cu-doped sensors exhibiting selective behavior towards ethanol.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Materials Science, Ceramics
Punitha Shanmugam, Guru Prasad Kuppuswamy, David Chidambaram, Ramji Kalidoss, Anandhakumar Sundaramurthy, Yuvaraj Sivalingam
Summary: The synergism between photosensitivity and gas sensitivity has enabled the development of low powered highly selective gas sensors. Organic/inorganic hybrid materials play a crucial role in this process, contributing to the coupling effect of light activated surface photovoltage modifications. This report disseminates the effect of visible light and volatile organic compounds (VOCs) on a hybrid sensing layer, providing valuable insights into the potential applications of this technology.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)