Flexible humidity-tolerant γ-FeO-rGO-based nanohybrids for energy efficient selective NO gas sensing
New Journal of Chemistry, ISSN: 1369-9261, Vol: 47, Issue: 10, Page: 4871-4879
2023
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Article Description
The present manuscript reports an energy efficient γ-FeO-rGO-based humidity tolerant nanohybrids, fabricated on flexible tempered glass (FTG), for NO gas sensing at room temperature. An interaction between n-type γ-FeO and p-type rGO semiconductors assisted in forming a p-n heterojunction at their interface, creating oxygen vacancies (O) in the γ-FeO phase, as revealed by XPS analysis. The O adsorbed on these sites produced O species, which facilitated the charge-transfer from O to NO to eventually reduce the resistivity. The voltage at 0.3 volt restricted the effect of humidity on NO gas sensing in a wide RH range (15-97%), making it not only humidity tolerant but also energy efficient. The bending of the FTG up to about 150° resulted in a negligible change in %response (from 56% to 50%) with a minor increase in recovery time, suggesting its potential for usage in flexible electronic devices. Its high selectivity for NO gas sensing is manifested by a minor decrease in %response from 56% to 49% in the presence of common air pollutant gases like Cl, NO, CO, NH, CHO, HS, and CHOH at 10-ppm of each. The role of rGO in the nanohybrids towards enhancing the conductivity is corroborated by the significantly lower %response observed (9%) for bare γ-FeO film on FTG. The efficient sensing of NO gas has been correlated based on the comparison of the electron affinity (eV) values with other probe gases, following the order: NO (2.30) > CO (1.32) > HO (1.3) > NH (0.16) > CHO (0.00152) > HS (−1.16). Thus, the as-designed γ-FeO-rGO-based NO gas sensor, operating at 0.3 V at RT, demonstrating selective sensing with rapid response/recovery times (0.08 min/0.25 min) for 0.5 ppm NO, having high %response, reproducibility, humidity tolerance in a wide RH range and long-term stability (>52 weeks), is suggested to be a novel NO gas sensing device.
Bibliographic Details
Royal Society of Chemistry (RSC)
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