Ultra-efficient trimethylamine gas sensor based on Au nanoparticles sensitized WO3 nanosheets for rapid assessment of seafood freshness

High-performance trimethylamine gas sensors based on defect-engineering MOF-derived ZnO nanoclusters with tunable surface oxygen vacancies

“…It has been reported that the construction of the heterojunction and surface modied by precious metal nanoparticles can effectively improve the sensitive properties of materials. [11][12][13][14] However, the fabrication process becomes complicated and the cost increases. In addition, the intrinsic defects in MOS materials also contribute to the gassensitive performance.…”

Enhanced Response for Foodborne Pathogens Detection by Au Nanoparticles Decorated ZnO Nanosheets Gas Sensor

“…Thus, the selectivity of these sensors, especially 1.0% Au/ZnO sensors, was quite outstanding. Meanwhile, the chemical sensitization effect was proven to be the most critical factor of enhanced sensitivity because the ratio of Au NPs decorated on ZnO NS barely influenced the selectivity [ 20 , 28 ]. The results of the discrimination evaluation are shown in Figure 6 d. Compared with the response of the 1.0% Au/ZnO NS sensor to 25 ppm 3H-2B, the variation of the responses did not exceed 10%, no matter what interference gases were mixed with 3H-2B.…”

“…Moreover, compared with the work function of ZnO (4.65 eV), that of Au (5.1 eV) is higher; therefore, Au NPs attract more electrons from the conduction band of ZnO. All these processes greatly increase the thickness of EDL and the resistance of Au/ZnO NS, which improve the sensitivity significantly [ 20 , 21 , 48 ]. Figure 8 c shows that the resistance of 1.0% Au/ZnO NS in the air was much higher compared with the resistance of pristine ZnO NS.…”

“…Moreover, it can also form Schottky contact with the MOS, so carriers are transferred from the MOS to the noble metal, which increases the Schottky barrier. At the same time, Au promotes the adsorption of O 2 molecules, transfers them to the material surface to form oxygen negative ions, increases the thickness of the electron depletion layer (EDL), improves the conductivity, and finally improves the sensitivity [ 20 , 21 ]. For instance, Wang et al showed that at 340 °C, Au/ZnO nanowires had a fast recovery time, greater response, better selectivity, and lower LOD for benzene and toluene than pure ZnO nanowires [ 22 ].…”

A Novel Gas Sensor for Detecting Pork Freshness Based on PANI/AgNWs/Silk

“…TMA in meat is usually detected by the spectrometry method [ 9 , 10 , 11 ]. Recently, gas sensors were used to measure the TMA and freshness in pork as a nondestructive, rapid, sensitive and inexpensive method [ 12 , 13 , 14 , 15 , 16 ]. Several materials have been studied for gas sensors, such as intrinsically conducting polymer, semiconducting metal-oxides and their composites [ 17 , 18 , 19 , 20 ].…”