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Reduced Graphene Oxide-Coated Si Nanowires for Highly Sensitive and Selective Detection of Indoor Formaldehyde
Song, LF; Luo, LQ; Xi, Y; Song, JJ; Wang, Y; Yang, LP; Wang, AQ; Chen, YF; Han, N; Wang, FY; Song, Longfei; Luo, Linqu; Xi, Yan; Song, Jianjun; Wang, Ying; Yang, Liping; Wang, Anqi; Chen, Yunfa; Han, Ning; Wang, Fengyun
2019
Source PublicationNANOSCALE RESEARCH LETTERS
ISSN1931-7573
Volume14
AbstractAlthough significant developments have been made in the low-concentration formaldehyde monitoring in indoor air by using gas sensors, they still suffer from insufficient performance for achieving ppb-level detection. In this work, <100> oriented Si nanowires (SiNWs) with high specific surface area were prepared via metal-assisted chemical etching method (MACE), and then were uniformly coated with graphene oxide (GO) followed by the subsequent reductive process in H-2/Ar atmosphere at 800 degrees C to obtain reduced graphene oxide (RGO). The RGO coating (RGO@n-SiNWs) obviously enhances SiNWs sensitivity to low-concentration formaldehyde, benefiting from the increased specific surface area, the sensitization effect of RGO, and the formation of p-n junction between SiNWs and RGO. Specifically, RGO@n-SiNWs exhibits a high response of 6.4 to 10ppm formaldehyde at 300 degrees C, which is about 2.6 times higher than that of pristine SiNWs (2.5). Furthermore, the RGO@n-SiNWs show a high response of 2.4 to 0.1ppm formaldehyde which is the largest permissive concentration in indoor air, a low detection limit of 35ppb obtained by non-linear fitting, and fast response/recovery times of 30 and 10s. In the meanwhile, the sensor also shows high selectivity over other typical interfering gases such as ethanol, acetone, ammonia, methanol, xylene, and toluene, and shows a high stability over a measurement period of 6days. These results enable the highly sensitive, selective, and stable detection of low-concentration formaldehyde to guarantee safety of indoor environment.
KeywordSi nanowires ZEOLITIC IMIDAZOLATE FRAMEWORK Reduced graphene oxide GAS SENSOR Sensitivity SENSING PROPERTIES Selectivity NANOFIBERS Formaldehyde NANOPARTICLES FABRICATION DIAGNOSIS NANOCUBES MIXTURES FILM
SubtypeArticle
DOI10.1186/s11671-019-2921-2
WOS IDWOS:000461353500004
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/28291
Collection中国科学院过程工程研究所
Recommended Citation
GB/T 7714
Song, LF,Luo, LQ,Xi, Y,et al. Reduced Graphene Oxide-Coated Si Nanowires for Highly Sensitive and Selective Detection of Indoor Formaldehyde[J]. NANOSCALE RESEARCH LETTERS,2019,14.
APA Song, LF.,Luo, LQ.,Xi, Y.,Song, JJ.,Wang, Y.,...&Wang, Fengyun.(2019).Reduced Graphene Oxide-Coated Si Nanowires for Highly Sensitive and Selective Detection of Indoor Formaldehyde.NANOSCALE RESEARCH LETTERS,14.
MLA Song, LF,et al."Reduced Graphene Oxide-Coated Si Nanowires for Highly Sensitive and Selective Detection of Indoor Formaldehyde".NANOSCALE RESEARCH LETTERS 14(2019).
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