摘要
在N,N-二甲基甲酰胺(DMF)溶剂中通过阳离子交换策略,将CdS量子点转变成具有近红外吸收能力的CdS@PbS核壳量子点。通过透射电子显微镜(TEM)、X射线粉末衍射仪(XRD)和紫外-可见-近红外分光光度计(UV-Vis-NIR)对CdS@PbS核壳量子点的形貌、元素组成、晶体结构和光学性质进行了表征。得益于该核壳量子点独特的近红外吸收特色,CdS@PbS核壳量子点被作为光活性层成功构建了自供能光电化学型近红外探测器。研究发现,在近红外光(即850 nm波长光)照射下,基于CdS@PbS核壳量子点的自供能光电化学型探测器的开关比达到2277,响应度为83.29 mA/W和比探测率为2.91×10^(11)Jones。值得注意的是,该探测器还展现了其光电流与入射光强具有良好的线性关系,表明该器件对不同强度的850 nm近红外光均能实现稳定的探测。
The CdS quantum dots(QDs)were converted into CdS@PbS core-shell QDs with near-infrared(NIR)absorption capacity by cation exchange strategy in N,N-dimethylformamide(DMF)solvent.We characterized the morphology,elemental composition,crystal structure and optical properties of CdS@PbS core-shell QDs by transmission electron microscopy(TEM),X-ray powder diffraction(XRD)and UV-Vis-NIR spectrophotometer.Considering their unique NIR absorption properties,these CdS@PbS core-shell QDs were specially utilized for fabricating self-powered photoelectrochemical-type NIR photodetector(PD).The PDs exhibit an excellent photoresponse performance under 850 nm illumination,with a typical on/off ratio of 2277,a responsivity of 83.3 mA/W,and a detectivity of 2.91×10^(11) Jones.Notably,the PD shows a good linear relationship between the photocurrent and the incident light intensity,indicating that the device can achieve stable detection under 850 nm illumination with different light intensities.
作者
李小丽
李艳莉
李冬
LI Xiao-Li;LI Yan-Li;LI Dong(Technology Innovation Center of Nanosized Natural Products and New Materials of Hebei Province,Heber Center for New Inorganic Optoelectronic Nanomaterial Research,School of Chemical Engineering and Materials,Handan University,Handan 056005,China)
出处
《应用化学》
北大核心
2025年第8期1078-1086,共9页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金(No.22171062)
河北省自然科学基金项目(No.B2021109002)
邯郸市科学技术研究与发展计划项目(No.23422404149ZC)
邯郸学院校级项目(No.XZ2022201)资助。
