Ag Nanoparticles Sensitized In2O3 Nanograin for the Ultrasensitive HCHO Detection at Room Temperature
| Autor: | Yumin Zhang, Bo Li, Huapeng Wang, Shiqiang Zhou, Haitang Wei, Jin Zhang, Jicu Hu, Qingjie Lu, Qingju Liu, Mingpeng Chen |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Formaldehyde Nanoparticle Nanochemistry Ag nanoparticles 02 engineering and technology Activation energy Ag loading 010402 general chemistry Gas sensors 01 natural sciences In2O3 Hydrothermal circulation chemistry.chemical_compound lcsh:TA401-492 General Materials Science 021001 nanoscience & nanotechnology Condensed Matter Physics HCHO detection 0104 chemical sciences chemistry Chemical engineering Surface modification lcsh:Materials of engineering and construction. Mechanics of materials 0210 nano-technology Selectivity |
| Zdroj: | Nanoscale Research Letters, Vol 14, Iss 1, Pp 1-11 (2019) |
| ISSN: | 1931-7573 |
| Popis: | Formaldehyde (HCHO) is the main source of indoor air pollutant. HCHO sensors are therefore of paramount importance for timely detection in daily life. However, existing sensors do not meet the stringent performance targets, while deactivation due to sensing detection at room temperature, for example, at extremely low concentration of formaldehyde (especially lower than 0.08 ppm), is a widely unsolved problem. Herein, we present the Ag nanoparticles (Ag NPs) sensitized dispersed In2O3 nanograin via a low-fabrication-cost hydrothermal strategy, where the Ag NPs reduces the apparent activation energy for HCHO transporting into and out of the In2O3 nanoparticles, while low concentrations detection at low working temperature is realized. The pristine In2O3 exhibits a sluggish response (Ra/Rg = 4.14 to 10 ppm) with incomplete recovery to HCHO gas. After Ag functionalization, the 5%Ag-In2O3 sensor shows a dramatically enhanced response (135) with a short response time (102 s) and recovery time (157 s) to 1 ppm HCHO gas at 30 °C, which benefits from the Ag NPs that electronically and chemically sensitize the crystal In2O3 nanograin, greatly enhancing the selectivity and sensitivity. |
| Databáze: | OpenAIRE |
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