Abstract
During the past two decades, one–dimensional (1D) metal–oxide nanowire (NW)-based molecular sensors have been witnessed as promising candidates to electrically detect volatile organic compounds (VOCs) due to their high surface to volume ratio, single crystallinity, and well-defined crystal orientations. Furthermore, these unique physical/chemical features allow the integrated sensor electronics to work with a long-term stability, ultra-low power consumption, and miniature device size, which promote the fast development of “trillion sensor electronics” for Internet of things (IoT) applications. This review gives a comprehensive overview of the recent studies and achievements in 1D metal–oxide nanowire synthesis, sensor device fabrication, sensing material functionalization, and sensing mechanisms. In addition, some critical issues that impede the practical application of the 1D metal–oxide nanowire-based sensor electronics, including selectivity, long-term stability, and low power consumption, will be highlighted. Finally, we give a prospective account of the remaining issues toward the laboratory-to-market transformation of the 1D nanostructure-based sensor electronics.
Highlights
Chemiresistive sensors integrated with metal–oxide semiconductor (MOS) nanostructures are of particular interest due to their high sensitivity and fast response [12,13,14,15,16]
A mat-like nanowire structure is similar to the single nanowire device with a flat deposition; and (e) nanowires transferred onto the platform
Through optimizingmetal–oxide the decorated overview of the sensing performance of noble metal-decorated nanowire gas sensors is summarized in Table material selection/combination, the size of nanoparticles, and the surface coverage of nanowires, it is accessible to realize the fabrication of functionalized nanowire sensors with high sensitivity, high selectivity, and low working temperature
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The large-scale synthesis of geometry uniform (diameter) nanowires is still a big challenge (2) Poor reproducibility—it has been demonstrated that the nanowires present a fantastic performance as they are integrated into single nanowire devices [69]. Performance degradation usually occurs in obtained sensor signal, the long-term stability of the sensorthe response is highly required the nanowire-based sensor electronics because surrounding oxygen, water, and confor time-series data collection [72]. Some critical issues that impede the practical cal application of alization, the 1D MOS sensorThen, electronics, including selectivity, application of the nanowire-based sensor electronics, including long-term stability, and low power consumption, will be pointed out.
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