CoS QDs/PDMS纳米复合薄膜的制备与红外特性研究  

Study on preparation and infrared properties of CoS QDs/PDMS nanocomposite films

作　　者：胡坤 张泰玮 李国彬 李学铭[1] 唐利斌[2,3] 杨培志 Hu Kun;Zhang Taiwei;Li Guobin;Li Xueming;Tang Libin;Yang Peizhi(Key Laboratory of Advanced Technique&Preparation for Renewable Energy Materials,Ministry of Education,School of Energy and Environmental Sciences,Yunnan Normal University,Kunming 650500,China;Kunming Institute of Physics,Kunming 650223,China;Yunnan Key Laboratory of Advanced Photoelectric Materials&Devices,Kunming 650223,China)

机构地区：[1]云南师范大学能源与环境科学学院可再生能源材料先进技术与制备教育部重点实验室,云南昆明650500 [2]昆明物理研究所,云南昆明650223 [3]云南省先进光电材料与器件重点实验室,云南昆明650223

出　　处：《红外与激光工程》2023年第12期23-31,共9页Infrared and Laser Engineering

基　　金：云南省科技厅科技人才与平台计划项目(202205AC160026);“春城计划”高层次人才引进培养工程项目(2022SCP005)。

摘　　要：过渡金属硫属化合物(TMCs)由于具有优异的光学、电学及光电等特性,被广泛应用于光催化、太阳电池、激光器等领域。作为一类典型的TMCs材料,硫化钴量子点(CoS QDs)因禁带宽度较窄而具有优异的近红外吸收特性,有望用于红外技术领域。文中采用液相超声剥离法制备了CoS QDs,再用共混法制备得到CoS QDs/PDMS纳米复合薄膜,并对它们的光学性质进行了研究,结果表明:CoS QDs的平均尺寸约为5 nm,大小均匀,呈球形;CoS QDs与CoS QDs/PDMS纳米复合薄膜在红外波段均存在明显的吸收和发光特性,且复合薄膜的红外吸收特性优于CoS QDs薄膜;随着激发光波长的增加,纳米复合薄膜的光致发光(PL)峰出现了红移,表现出明显的Stokes位移效应和激发波长依赖性。CoS QDs/PDMS纳米复合薄膜优异的红外吸收和发光特性,表明其在红外探测、荧光成像、纳米光子器件等研究领域中具有重要的潜在应用价值,有望成为一种新型红外探测材料。Objective TMCs have been widely used in photocatalysis,solar cells,lasers and other fields because of their excellent optical,electrical and photoelectric properties.As a typical TMCs material,CoS QDs have excellent near-infrared absorption properties due to their narrow band gap and are expected to be used in infrared technology.CoS QDs are expected to be an important material for infrared detector preparation.In order to improve the optical properties and processing properties of CoS QDs,CoS QDs were further prepared into nanocomposite films to expand their application range.At present,the research work on CoS mainly focuses on CoS NPs,and there are few reports on quantum dot composite films.Therefore,the CoS QDs prepared by liquid phase ultrasonic exfoliation method are blended with PDMS,and the infrared properties of CoS QDs/PDMS nanocomposite films are studied.In order to expand the application of CoS QDs in infrared optics.Methods CoS QDs solution was prepared by liquid phase ultrasonic exfoliation method.The preparation steps were as follows:0.15 g CoS powder(purity≥99.5%)was weighed and put into a mortar and fully ground for 2 h;The ground CoS powder was evenly mixed with 50 mL of anhydrous ethanol(purity≥99.7%)dispersant,and placed in the ultrasonic instrument at 90 W power for 2 h;The ultrasonic solution was centrifuged at a rotational speed of 500 r/min for 5 min.Taking out the supernatant,CoS QDs solution was obtained.The CoS QDs solution is dried for later use.CoS QDs/PDMS nanocomposite films were prepared by blending method.5 mL of the basic component A of PDMS and 0.5 mL of the curing agent B were transferred to the beaker,and appropriate amount of the dried CoS QDs powder was added,stirred with a magnetic stirrer for 5 min,and then transferred to the petri dish and heated at 30℃until film formation.The size,morphology,structure and elemental components of CoS QDs were characterized by transmission electron microscopy(TEM),atomic force microscopy(AFM)and energy dispersive spectrometry(EDS).Th

关 键 词：液相超声剥离 硫化钴 量子点 纳米复合薄膜 红外特性 

分 类 号：O484.41[理学—固体物理]