Article
Materials Science, Multidisciplinary
Sunghoon Park, Young Woo Jung, Gwang Min Ko, Dae Yong Jeong, Chongmu Lee
Summary: In this study, In2O3 NP-decorated SnO2 NW sensor demonstrated strong response to NO2 and fast sensing speed. The importance of heterostructure formation and operating temperature optimization on the sensor response was confirmed through experimental results, with a focus on the gas sensing mechanism of the nanostructures for different sensing variables.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Chemistry, Analytical
Sahil Gasso, Manreet Kaur Sohal, Aman Mahajan
Summary: This study synthesized MXene-based SnO2 heterostructures for room-temperature NO2 detection. The optimized SnO2/MXene heterostructures exhibited high response and short response and recovery time towards 30ppb NO2 at room temperature. The sensor also showed high selectivity, sensitivity, repeatability, and stable sensing response under humid conditions.
SENSORS AND ACTUATORS B-CHEMICAL
(2022)
Article
Chemistry, Analytical
Phan Hong Phuoc, Nguyen Ngoc Viet, Le Viet Thong, Chu Manh Hung, Nguyen Duc Hoa, Nguyen Van Duy, Hoang Si Hong, Nguyen Van Hieu
Summary: The study explored the gas-sensing performance of composite nanofibers with internal and external hetero-junctions of ZnO-SnO2, revealing enhanced response compared to mixed nanofibers. The gas-sensing mechanism of the hetero-nanojunctions was analyzed, attributing the remarkable gas sensing performance to the formation of internal heterojunctions.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Weiqi Wang, Jiamu Cao, Rongji Zhang, Huaxin Xiu, Yufeng Zhang
Summary: In this study, a MoS2/AuPt/SnO2 nanocomposite device was fabricated by interfacially engineering a MoS2/SnO2 nanostructure using Au and Pt bimetallic nanoparticles. The device exhibited remarkable sensing response, short response time, and excellent baseline recovery to NO2 gas at room temperature, as well as high sensitivity, low detection limit, commendable reversibility, stability, and selectivity against various gases. This work advances the development of room-temperature gas-sensitive nanomaterials and shows promise for applications in ultralow power-integrated sensors.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Analytical
Guillem Domenech-Gil, Jordi Sama, Cristian Fabrega, Isabel Gracia, Carles Cane, Sven Barth, Albert Romano-Rodriguez
Summary: We present a methodology for localized growth of nanowires on micro-hotplates that allows independent adjustment of the device's resistance and gas response. Fabrication of nanowire-containing stripes with or without gaps enables nanowires to bridge current, and we demonstrate this approach with SnO2 nanowire-based chemoresistors. The results show the capability of tailoring nanowire stripe sizes and empty areas along the sensing material, resulting in up to 500 times response increase. The absence of nucleation seeds in the gap areas restricts current flow along the nanowire bridges, enhancing surface conduction controlled by nanowire-gas interaction.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Materials Science, Multidisciplinary
Jae Hoon Bang, Namgue Lee, Ali Mirzaei, Myung Sik Choi, Hyeong Su Choi, Hyunwoo Park, Hyeongtag Jeon, Sang Sub Kim, Hyoun Woo Kim
Summary: The study demonstrated that functionalizing SnO2 nanowires with SnS nanoparticles could enhance the sensing performance of NO2 gas, with improved response time compared to bare SnO2 nanowires. This approach could lead to the development of low-temperature SnO2 NW-based gas sensors.
MATERIALS CHARACTERIZATION
(2021)
Article
Chemistry, Analytical
Myung Sik Choi, Ali Mirzaei, Han Gil Na, Sangwoo Kim, Dong Eung Kim, Kyu Hyoung Lee, Changhyun Jin, Sun-Woo Choi
Summary: This study proposed a method to enhance the gas sensing properties of metal oxide nanowires by preparing Pd metal catalyst surrounded by SnO2-x with structural defects on the surface of SnO2 nanowires. Gas sensing studies demonstrated the promising effects of this approach, showing the usefulness of significantly enhancing the gas sensing properties.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Analytical
Vo Thanh Duoc, Chu Manh Hung, Hugo Nguyen, Nguyen Van Duy, Nguyen Van Hieu, Nguyen Duc Hoa
Summary: The grafted structures between SnO2 and ZnO nanowires were achieved through a two-step growth process, showing promising sensitivity for NO2 gas sensing.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Hongying Lin, Junhe Wang, Shiqiang Xu, Qiang Zhang, Yongqiang Cheng, Dan Han, Hongtao Wang, Kai Zhuo
Summary: By functionalizing Au into WO3 nanofibers, the effect of different Au layer thicknesses on the sensor performance was studied. It was found that the 10 nm Au-WO3 composite nanomaterial sensor exhibited the most significant improvement, with optimal operating temperature at 175℃, excellent selectivity, and high sensitivity.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Yinghua Qiu, Yunpeng Wang
Summary: Controlling the morphology of W18O49 nanostructures is essential for achieving high NO2-sensing performance. In this study, W18O49 nanostructures were synthesized through a solvothermal process by adjusting various parameters. Under optimized conditions, one-dimensional nanoneedles composed of mono-clinic W18O49 were obtained, which exhibited excellent gas sensing performance towards NO2. The W18O49 nanoneedles showed a high response to NO2 in a wide range of concentrations, excellent selectivity, and long-term stability, attributed to the presence of oxygen vacancies, needle-shaped nanostructures, and high BET surface area.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Analytical
Jihee Kim, Masoud Nazarian-Samani, Jihyun Lee, Sang-kil Lee, Kyu Hyong Lee, Ji Hee Pi, Yu Jin Kim, Sanghyeon Lee, Wooyoung Lee
Summary: High selectivity and fast response are crucial for protecting human health in dangerous environments. The p-n SnO/SnO2 heterostructure, with its synergistic effect on semiconducting properties and interfacial electric field, shows excellent sensing performances. It has a high response rate, fast response time, and superior selectivity compared to other target gases. The presence of oxygen vacancies in the SnO/SnO2 heterostructure is supported by Raman and EPR results, and the role of these vacancies as an effective electron donor for adsorbed oxygen molecules and NO2 target gas is described by XPS and ToF-SIMS analyses. The direct formation of oxygen vacancies in SnO/SnO2 heterostructures is an important reference for the development of high-performance NO2 gas sensors.
SENSORS AND ACTUATORS B-CHEMICAL
(2024)
Article
Chemistry, Multidisciplinary
Mingjia Bai, Chaoyang Li, Xiaojun Zhao, Qingji Wang, Qinhe Pan
Summary: ZnO, a wide band gap semiconductor metal oxide, has excellent electrical properties and gas-sensitive properties. However, current ZnO-based gas sensors operate at high temperatures, which is not practical. In this study, three-dimensional sheet-flower ZnO was successfully synthesized by a simple water bath method. The gas sensor based on sheet-flower ZnO exhibited high response values to NO2 without modification, with optimal operating temperature at 125 degrees C and a response value of 125 to 1 ppm NO2. It also showed lower detection limit, good selectivity, and stability.
Article
Nanoscience & Nanotechnology
Weimeng Zheng, Zhongyue Zhang, Nannan Liu, Qingyu Li, Jianbo Sun
Summary: Heterolayered SnO2/SnSe nanosheet composites were synthesized and used as a highly sensitive sensor for NO2 detection at room temperature. The sensor exhibited high sensitivity and selectivity, as well as a low detection limit. The improved sensing performance was attributed to the presence of abundant heterojunctions and enhanced interface charge transfer in the material.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Hyoungwon Park, Jae-Hun Kim, Dustin Vivod, Sungil Kim, Ali Mirzaei, Dirk Zahn, Changkyoo Park, Sang Sub Kim, Marcus Halik
Summary: This study enhanced the sensing capabilities of semiconducting metal oxide-based gas sensors through a new post-modification method, improving gas selectivity; the chemical-affinity-driven interaction between SAM and gas molecules enabled selective gas sensing.
Article
Chemistry, Physical
Liang-Yan Guo, Sheng-Yuan Xia, Yaxiong Tan, Zhengyong Huang
Summary: With the rapid development of the economy, the problem of gas pollution has gained increasing attention, making the development of new gas sensing materials crucial. In this study, a SnO2-GeSe monolayer was constructed using the DFT method, and its gas-sensitive adsorption parameters for NO2, H2O, and CO2 gases were calculated and studied. The results revealed that the SnO2-GeSe monolayer exhibited good selectivity and sensitivity towards NO2, H2O, and CO2, with H2O being the most sensitive.
SURFACES AND INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Quang Khue Vu, Quang Huy Tran, Ngoc Phan Vu, Tuan-Le Anh, Thi Thanh Le Dang, Tonezzer Matteo, Thi Hong Hanh Nguyen
Summary: The study prepared carbon screen-printed electrodes modified with gold nanoparticles for label-free detection of E. coli O157. The biosensors showed stable and effective electrochemical signals, capable of detecting bacteria rapidly without labels, with potential for portable diagnostics of food-borne and hospital-acquired infections.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Tran Thi Ngoc Hoa, Dang Thi Thanh Le, Nguyen Van Toan, Nguyen Van Duy, Chu Manh Hung, Nguyen Van Hieu, Nguyen Duc Hoa
Summary: In this study, WO3-coated SnO2 nanowires were fabricated for H2S gas sensors, showing good sensitivity and selectivity to low-concentration H2S gas at 200 degrees Celsius. The gas-sensing mechanism was discussed based on the n-n heterojunction between n-type SnO2 and n-type WO3, enhancing sensitivity to H2S.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Chemistry, Analytical
Phan Hong Phuoc, Nguyen Ngoc Viet, Le Viet Thong, Chu Manh Hung, Nguyen Duc Hoa, Nguyen Van Duy, Hoang Si Hong, Nguyen Van Hieu
Summary: The study explored the gas-sensing performance of composite nanofibers with internal and external hetero-junctions of ZnO-SnO2, revealing enhanced response compared to mixed nanofibers. The gas-sensing mechanism of the hetero-nanojunctions was analyzed, attributing the remarkable gas sensing performance to the formation of internal heterojunctions.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Nanoscience & Nanotechnology
Thao Dao Vu Phuong, Thuy-Linh Phi, Bui Huu Phi, Nguyen Van Hieu, Son Tang Nguyen, Tu Le Manh
Summary: This study provides a comprehensive investigation into the early stage of copper electrodeposition from a choline chloride-urea deep eutectic solvent (DES), revealing that copper deposition can be directly performed from a DES containing a small amount of water using a single potentiostatic step technique. Theoretical modeling confirms the mechanism of direct electronucleation of copper nanoparticles in the DES, and kinetic parameters play a crucial role in controlling the morphology and chemical composition of the obtained nanoparticles, as verified by surface characterization techniques.
JOURNAL OF NANOMATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Nguyen Manh Hung, Chu Manh Hung, Nguyen Van Duy, Nguyen Duc Hoa, Hoang Si Hong, Tran Khoa Dang, Nguyen Ngoc Viet, Le Viet Thong, Phan Hong Phuoc, Nguyen Van Hieu
Summary: A unique combination of nanojunction-networked SnO2 nanowires and pulsed UV-radiation shows high response gas sensors working at room temperature. The pulsed UV-radiation significantly enhances gas response and reduces response and recovery times. The enhancement of gas response is attributed to the photogeneration of electron-hole pairs.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Materials Science, Ceramics
To Thi Nguyet, Chu Manh Hung, Dang Thi Thanh Le, Nguyen Van Duy, Nguyen Duc Hoa, Franco Biasioli, Matteo Tonezzer, Corrado Di Natale
Summary: The ultra-thin ZnO nanoplates exhibit significantly improved sensing performance for NO2 gas detection compared to the nanosheets, thanks to their high specific surface area and very small thickness.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Quang Khue Vu, Thi Hue Nguyen, Anh-Tuan Le, Ngoc Phan Vu, Xuan Dinh Ngo, Tien Khi Nguyen, Thanh Thuy Nguyen, Chung Van Pham, Thi Luyen Nguyen, Thanh Le Thi Dang, Matteo Tonezzer, Quang Huy Tran
Summary: This paper presents a reliable solution to enhance the electron transfer and stability of screen-printed carbon electrodes (SPCEs) for the direct detection of pathogenic bacteria. By modifying the SPCEs with a nanocomposite of silver nanoparticles (AgNPs) and reduced graphene oxide (rGO), the peak current was increased and the charge transfer resistance was decreased. The modified electrodes could detect Salmonella bacteria directly with a low limit of detection (LoD) of 22 CFU/mL.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Analytical
Vo Thanh Duoc, Chu Manh Hung, Hugo Nguyen, Nguyen Van Duy, Nguyen Van Hieu, Nguyen Duc Hoa
Summary: The grafted structures between SnO2 and ZnO nanowires were achieved through a two-step growth process, showing promising sensitivity for NO2 gas sensing.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Engineering, Electrical & Electronic
Dang Ngoc Son, Chu Manh Hung, Dang Thi Thanh Le, Chu Thi Xuan, Nguyen Van Duy, Nguyen Quang Dich, Hugo Nguyen, Nguyen Van Hieu, Nguyen Duc Hoa
Summary: This study explores the design and influence of electrode gap on the performance of self-heated In2O3 nanowire gas sensors. It is found that using a larger gap enables the sensor to detect ethanol gas effectively with low power consumption. Additionally, the conductivity of the nanowire plays a significant role in the detection of reducing gas by the self-heated sensor.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Chemistry, Multidisciplinary
Lai Van Duy, To Thi Nguyet, Dang Thi Thanh Le, Nguyen Van Duy, Hugo Nguyen, Franco Biasioli, Matteo Tonezzer, Corrado Di Natale, Nguyen Duc Hoa
Summary: Gas sensors are crucial for various aspects of human life, including production processes, occupational safety, food quality assessment, and air pollution monitoring. The development of gas sensors that are efficient, small, and inexpensive is a challenge but important for environmental and human health protection. In this paper, a resistive sensor based on thin V2O5 nanosheets for ammonia detection at room temperature was reported, with good performance and selectivity.
Proceedings Paper
Acoustics
Ha Minh Tan, Duc-Quang Vu, Chung-Ting Lee, Yung-Hui Li, Jia-Ching Wang
Summary: This paper proposes a selective mutual learning approach to improve the performance of network for speech separation by sharing knowledge between two networks.
2022 IEEE INTERNATIONAL CONFERENCE ON ACOUSTICS, SPEECH AND SIGNAL PROCESSING (ICASSP)
(2022)
Article
Computer Science, Information Systems
Ha Minh Tan, Kai-Wen Liang, Yuan-Shan Lee, Chung-Ting Li, Yung-Hui Li, Jia-Ching Wang
Summary: The proposed ESDC model enhances speech separation performance by combining node encoder, Squash-norm, and deep clustering methods, achieving better separation results compared to baseline models.
Review
Chemistry, Multidisciplinary
Matteo Tonezzer, Dang Thi Thanh Le, Lai Van Duy, Nguyen Duc Hoa, Flavia Gasperi, Nguyen Van Duy, Franco Biasioli
Summary: Metal oxides are ideal for gas sensors due to their sensitivity and simplicity, but they lack selectivity. This review analyzes scientific articles on electronic noses based on metal oxide nanowires, which address the issue of selectivity by using multivariate statistical algorithms. The review covers various applications such as health, agrifood, and security.
NANOTECHNOLOGY REVIEWS
(2022)
Article
Nanoscience & Nanotechnology
Chu Manh Hung, Lai Van Duy, Dang Thi Thanh Le, Hugo Nguyen, Nguyen Van Duy, Nguyen Duc Hoa
Summary: By decorating Pd nanoparticles onto ZnO nanostructures, the optimal working temperature of the sensor can be significantly reduced, with improved response and recovery time to acetone, as well as increased sensitivity and detection limit. The Pd-ZnO sensor demonstrates effective reusability through multiple on/off switching cycles.
JOURNAL OF SCIENCE-ADVANCED MATERIALS AND DEVICES
(2021)
Article
Chemistry, Multidisciplinary
Tran Thi Ngoc Hoa, Nguyen Van Duy, Chu Manh Hung, Nguyen Van Hieu, Ho Huu Hau, Nguyen Duc Hoa