Low temperature-boosted high efficiency photo-induced charge transfer for remarkable SERS activity of ZnO nanosheets
文献类型：期刊论文
| 作者 | Lin, Jie; Yu, Jian; Akakuru, Ozioma Udochukwu; Wang, Xiaotian; Yuan, Bo; Chen, Tianxiang; Guo, Lin; Wu, Aiguo |
| 刊名 | CHEMICAL SCIENCE
 |
| 出版日期 | 2020 |
| 卷号 | 11期号:35页码:9414-9420 |
| 关键词 | ENHANCED RAMAN-SCATTERING SILVER NANOPARTICLES SENSITIVITY MOLECULES SPECTRA NANOSPHERES EMISSION DENSITY |
| DOI | 10.1039/d0sc02712j |
| 英文摘要 | Improving the photo-induced charge transfer (PICT) efficiency is the key factor for boosting the surface-enhanced Raman scattering (SERS) performance of semiconductor nanomaterials. Introducing plentiful surface defect states in porous ZnO nanosheets (d-ZnO NSs) effectively provides additional charge transfer routes for highly efficient PICT within the substrate-molecule system. Significantly, an interesting phenomenon of low temperature-boosted SERS activity of these d-ZnO NSs is consequently observed. The enhanced SERS activity can be attributed to the efficient PICT processes due to the significant reduction of non-radiative recombination of surface defects at a low temperature. This is carefully investigated through combining in situ low-temperature SERS measurements with temperature-dependent photoluminescence (PL) emission spectroscopy. Our results clearly demonstrate that the weakened lattice thermal vibration at a low temperature effectively suppresses the phonon-assisted relaxation and reduces carrier traps, resulting in the increase of PL intensity. The decreased traps of photo-induced electrons at surface defect states effectively facilitate the PICT efficiency within the substrate-molecule system. An ultrahigh enhancement factor of 7.7 x 10(5) and low limit of detection (1 x 10(-7) M) for a 4-mercaptopyridine molecule at a temperature of 77 K are successfully obtained. More importantly, the low temperature-enhanced SERS effect is also obtainable in other metal oxide semiconductors, such as d-TiO2 and d-Cu2O nanoparticles. To the best of our knowledge, this is the first time the low temperature-boosted SERS activity of semiconductors has been observed. This study not only provides a deep insight into the chemical SERS mechanism, but also develops a novel strategy for improving semiconductor SERS sensitivity. The strong SERS activity at a low temperature reported here may open new avenues for developing non-metal SERS substrates with new functionalities, especially for the research on cryogenic sensing and hypothermal medicine. |
| 学科主题 | Chemistry |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/20492]  |
| 专题 | 2020专题 2020专题_期刊论文 |
| 作者单位 | 1.Guo, L (corresponding author), Beihang Univ, Sch Chem, Beijing 100191, Peoples R China. 2.Chen, TX 3.Wu, AG (corresponding author), Chinese Acad Sci, Cixi Inst Biomed Engn, Zhejiang Engn Res Ctr Biomed Mat, Ningbo Inst Mat Technol & Engn,CAS,Key Lab Magnet, 1219 Zhongguan West Rd, Ningbo 315201, Peoples R China. 4.Wang, XT |
| 推荐引用方式 GB/T 7714 | Lin, Jie,Yu, Jian,Akakuru, Ozioma Udochukwu,et al. Low temperature-boosted high efficiency photo-induced charge transfer for remarkable SERS activity of ZnO nanosheets[J]. CHEMICAL SCIENCE,2020,11(35):9414-9420. |
| APA | Lin, Jie.,Yu, Jian.,Akakuru, Ozioma Udochukwu.,Wang, Xiaotian.,Yuan, Bo.,...&Wu, Aiguo.(2020).Low temperature-boosted high efficiency photo-induced charge transfer for remarkable SERS activity of ZnO nanosheets.CHEMICAL SCIENCE,11(35),9414-9420. |
| MLA | Lin, Jie,et al."Low temperature-boosted high efficiency photo-induced charge transfer for remarkable SERS activity of ZnO nanosheets".CHEMICAL SCIENCE 11.35(2020):9414-9420. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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