Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 9, Issue 42, Pages 23955-23967Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/d1ta06346d
Keywords
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Funding
- National Natural Science Foundation of China [51973070, 51773069]
- Science and Technology Program of Guangzhou [2019050001]
- Innovative Team Project of Education Bureau of Guangdong Province, Guangdong Basic and Applied Basic Research Foundation [2021A1515012420]
- Startup Foundation from SCNU, Guangdong Recruitment Program of Foreign Experts [191900016]
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology [2017B030301007]
- King Khalid University
- Guangdong Mixwell Technology Co., Ltd.
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This study developed a visible-light-sensitive ZnOx@ANS-rGO sensor with high sensitivity at room temperature for detecting trace formaldehyde. The sensor demonstrated excellent efficiency and accuracy, and was confirmed to have good selectivity, long-term stability, repeatability, and humidity resistance through practical performance evaluation in a 30 m(3) chamber.
Implementing sensitive and fast ppb-level formaldehyde sensing at room temperature is still in extreme demand for practical indoor air quality monitoring. Herein, we developed a visible-light-sensitive and dipole-modified graphene-based nanocomposite ZnOx@ANS-rGO for ultrasensitive trace formaldehyde sensing. The rich oxygen vacancy zinc oxide (ZnOx) nanoparticles on graphene nanosheets provide OH-groups and edge sorption sites to facilitate the activation of adsorbed oxygen. Moreover, the supramolecular assembled 5-aminonaphthalene-1-sulfonic acid-modified graphene (ANS-rGO) nanosheets with donor-pi-acceptor dipole served as an excellent conduction platform to transport and collect photo-generated electrons. Based on the collaboration of rich ZnOx and ANS-rGO, the obtained sensor ZnOx@ANS-rGO-0.1 showed the highest response (R-a/R-g = 1.58 to 1 ppm HCHO) among the MOS materials reported so far, and its limit of detection (LOD) can be as low as 5 ppb under 405 nm light illumination at RT. The outstanding efficiency and accuracy of the obtained gas sensor were confirmed by practical performance estimation in a 30 m(3) chamber. The selectivity, long-term stability, repeatability and humidity resistance of the obtained sensors at RT were also revealed. The sensing mechanism based on the combination of visible-light activation and dipole modification was analyzed by the O-XPS, PL, in situ ATR-FTIR and charge density difference calculation.
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