A highly sensitive ethanol sensor based on Ag@TiO 2 nanoparticles at room temperature

Detection of hazardous volatile organic compounds (VOCs) by metal oxide nanostructures-based gas sensors: A review

“…Among the sensor devices considered, conductometric (resistive) gas sensors based on metal oxides are the most promising for monitoring harmful VOCs. The success of these types of devices are mainly due to their many advantages, such as strong response, high sensitivity, small dimensions, ease of use, portability, simple design, on-line operation, rapid response time, stable repeatability for reuse in the same process, simplicity in fabrication, compact size, real-time detection, low detection limits, low cost, and low power consumption [13][14][15][16]. On the other hand, despite the many worthy advantages, metal oxide sensors require high operating temperatures (typically 150 °C to 500 °C) and generally they have poor selectivity in detection of similar gaseous species [17].…”

Synthesis, Characterization and Gas Sensing Properties of Ag@α-Fe2O3 Core–Shell Nanocomposites

“…However, recent investigations about metal@metal oxide core–shell as gas sensor have suggested that combination of metal (core) and metal oxide (shell) structure can enhance the sensitivity of gas sensor [2,3]. For example Zhu et al [4] reported an ethanol gas sensor using Ag@TiO 2 that showed higher sensing properties in comparison with pure TiO 2 . In fact from practical point of view when metal is as a core it not affected by surrounding medium and consequently corrosion or dissolution metal will not occur.…”

TiO2/Pt/TiO2 Sandwich Nanostructures: Towards Alcohol Sensing and UV Irradiation-Assisted Recovery

“…In this work, the TiO 2 /Pt/TiO 2 sandwich nanostructures were prepared by sputtering technique and were used as sensing material for ethanol, methanol, and 2-propanol detection in the sensor response results of the TiO 2 /Pt/TiO 2 sandwich nanostructures to the recent researches on ethanol sensing which are mostly based on ZnO, SnO 2 , and TiO 2 with various structures, such as nanoparticle, nanosphere, core-shell, nanotube and thin film, and various doping conditions [12][13][14][15][16][17][18]; it was found that the TiO 2 /Pt/TiO 2 sandwich nanostructures show advantages in terms of 10 ppm level sensitivity, roomtemperature operation, and stability. However, Ag@TiO 2 core-shell nanoparticles show the highest sensitivity down to 0.15 ppm ethanol with a fast response time and a fast recovery time but its fabrication process relies on wet process, which is time-consuming [15].…”

“…However, Ag@TiO 2 core-shell nanoparticles show the highest sensitivity down to 0.15 ppm ethanol with a fast response time and a fast recovery time but its fabrication process relies on wet process, which is time-consuming [15].…”

“…The nanostructured materials, such as nanoparticle, nanowire, nanorod, and nanotube have demonstrated excellent sensing performance compared to conventional thin films [8][9][10][11][12][13][14][15][16][17][18][19][20]. The high selectivity of the sensors has been improved by surface modification with noble metals such as Pt and Pd [21,22].…”