Gas sensor technology is widely utilized in various areas ranging from home security, environment and air pollution, to industrial production. It also hold great promise in non-invasive exhaled breath detection and an essential device in future internet of things. The past decade has witnessed giant advance in both fundamental research and industrial development of gas sensors, yet current efforts are being explored to achieve better selectivity, higher sensitivity and lower power consumption. The sensing layer in gas sensors have attracted dominant attention in the past research. In addition to the conventional metal oxide semiconductors, emerging nanocomposites and graphene-like two-dimensional materials also have drawn considerable research interest. This inspires us to organize this comprehensive 2020 gas sensing materials roadmap to discuss the current status, state-of-the-art progress, and present and future challenges in various materials that is potentially useful for gas sensors.
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http://dx.doi.org/10.1088/1361-648X/abf477 | DOI Listing |
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December 2024
Centre for Nanoscience and Engineering, Indian Institute of Science, Bengaluru, 560012, India.
The design of mixed-dimensional heterostructures has emerged to be a new frontier of research as it induces exciting physical/chemical properties that extend beyond the fundamental properties of single dimensional systems. Therefore, rational design of heterostructured materials with novel surface chemistry and tailored interfacial properties appears to be very promising for the devices such as the gas sensors. Here, a highly sensitive gas sensor device is constructed by employing heterostructures of boron doped molybdenum disulfide quantum dots (B-MoS Qdots) assembled into the matrix of TiCT MXene.
View Article and Find Full Text PDFSpectrochim Acta A Mol Biomol Spectrosc
December 2024
College of Ocean Food and Biological Engineering, Jimei University, Xiamen 361021, China. Electronic address:
Total volatile base nitrogen (TVB-N) is an important indicator for evaluating the freshness of aquatic products and holds great significance in assessing food safety. Traditional testing methods for TVB-N content use the Kjeldahl method, which has shortcomings like lengthy processes, cumbersome steps, and sample destruction. This study innovatively couples the hyperspectral imaging (HSI) technique with an odor imaging sensor (OIS) to achieve non-destructive prediction of TVB-N content in the large yellow croaker.
View Article and Find Full Text PDFSci Rep
December 2024
PetroChina Kunlun Gas Co., Ltd. Sichuan Branch, Chengdu Sichua, China.
During the filling process of LNG tank trucks, due to the long-term operation of filling equipment in low temperature and high-pressure conditions, the sealing parts in the equipment are prone to failure, leading to leaks. The reasons for the leakage of LNG filling equipment were analyzed, and the diffusion of LNG after different equivalent leakage hole diameters and different wind speeds were numerically analyzed. A gas leak monitoring system suitable for LNG filling stations was established based on TDLAS technology.
View Article and Find Full Text PDFPhotoacoustics
February 2025
College of Control Science & Engineering, China University of Petroleum (East China), Qingdao 266580, PR China.
Traditional beat frequency quartz-enhanced photoacoustic spectroscopy (BF-QEPAS) are limited by short energy accumulation times and the necessity of a decay period, leading to weaker signals and longer measurement cycles. Herein, we present a novel optomechanical energy-enhanced (OEE-) BF-QEPAS technique for fast and sensitive gas sensing. Our approach employs periodic pulse-width modulation (PWM) of the laser signal with an optimized duty cycle, maintaining the quartz tuning fork's (QTF) output at a stable steady-state level by applying stimulus signals at each half-period and allowing free vibration in alternate half-periods to minimize energy dissipation.
View Article and Find Full Text PDFTalanta
December 2024
Tianjin Key Laboratory of Risk Assessment and Control Technology for Environment and Food Safety, Military Medical Sciences Academy, Tianjin, 300050, China. Electronic address:
The detection of ammonia (NH)gas holds significant importance in both daily life and industrial production. In this study, the NbCT/MoSe sensor was synthesized using a one-step hydrothermal method and applied for NH detection. The morphology and elemental composition of the composites were analyzed through a series of characterization techniques including XRD, TEM, SEM, and XPS, confirming the successful synthesis of NbCT/MoSe composite with the optimal mass ratio.
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