光致发光
材料科学
量子点
光学
碳量子点
光电子学
碳纤维
复合材料
物理
复合数
作者
Jia Liu,Hailong Yu,Shuang Yang,Hengli Feng,Hongyan Meng,Xin Zhang,Yachen Gao
标识
DOI:10.1016/j.optcom.2024.131061
摘要
In recent years, non-contact temperature reading sensors based on carbon quantum dots (CQDs) have attracted a lot of attention, most researchers have studied them at room temperature and high temperature. In this paper, red-CQDs (R-CQDs) was synthesized by hydrothermal method using o-phenylenediamine and chemically characterized by transmission electron microscopy, Fourier transform spectroscopy and X-ray photoelectron spectroscopy. The bandgap energy of R-CQDs was calculated from the absorption spectra, and the photoluminescence (PL) spectra at different laser powers showed that the PL of the R-CQDs were single-photo absorbing process. For better application, R-CQDs/polyvinyl alcohol (PVA) films were prepared. The PL properties of the film were studied. Experiments show in temperature range of 190∼260 K, the PL intensity decreases linearly with increasing temperature. Relative sensitivities of temperature sensing were calculated to be about -0.62% K-1. This work demonstrates the feasibility of its application in low temperature sensing.
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