| Title | Giant Humidity Responsiveness of Platinum Functionalized WS 2 Nanosheet Based Chemiresistors |
| Publication Type | Conference Paper |
| Year of Publication | 2020 |
| Authors | Gupta, A, Sakhuja, N, Jha, R, Bhat, N |
| Conference Name | 2020 IEEE Sensors |
| Publisher | IEEE |
| Keywords | Humidity, Platinum, Sensitivity, Sensors, temperature measurement, Temperature sensors, Two dimensional displays |
| Abstract | In this paper, WS2 nanosheets (NS) were prepared by the liquid phase exfoliation (LPE) method, and the exfoliated WS2 NS were further functionalized with Pt-nanoparticles (NPs) via the wet chemical approach. The humidity sensing characteristics for both pristine WS2 NS as well as Pt-decorated WS2 NS were recorded at room temperature in moderate relative humidity (RH) range of 25%-55%. The Pt-decorated WS2 NS based sensors showed a very high response of 4.92 (at 25% RH) to 35,852 (at 55% RH) which is about 1.6X (at 25% RH) – 105.1X (at 55% RH) higher than pristine WS2 based devices. The Pt-decorated WS2 sensors also showed a significant improvement in the response time (of the order of ~130 seconds) and a notable improvement in the recovery time (of the order of ~20 seconds) over its pristine counterpart. Also, the sensitivity of pristine WS2 NS based sensor was 16.5 per RH%, which increased to 1,792 per RH% upon Pt decoration. All these results collectively suggest that the decoration of WS2 NS by noble metal NP like Pt has a positive impact on humidity sensing properties. |
| DOI | 10.1109/SENSORS47125.2020.9278608 |
