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以巯基小分子为配体水相合成CdTe量子点,通过调节回流时间调控其粒径大小.由于量子点的宽谱激发特性,在蓝光(473 nm)或绿光(532 nm)条件下,纳米金属薄膜表面不同发射波长的CdTe量子点均可被激发而与金属表面等离子体发生耦合相互作用,从而在棱镜一侧发出高度定向的偏振荧光,其荧光特性与样品厚度密切相关.表面等离子体耦合荧光发射法(SPCE)具有波长分辨性质,不同颜色的量子点在不同角度定向发射,发射波长越长,角度越小.720nm和630 nm量子点的自由空间发射荧光光谱呈现交叠,然而,基于SPCE的波长分辨性质,我们通过改变检测角度避开光谱重叠,在棱镜一侧的43o和51o处分别得到了两种量子点的SPCE荧光单峰.量子点是SPCE在多通路、高通量检测应用中荧光物种的理想选择.
The CdTe QDs were synthesized in the water phase by the small molecule of thiol and the particle size was controlled by adjusting the reflux time.As a result of the wide-band excitation of QDs, under the conditions of blue (473 nm) or green (532 nm) The CdTe quantum dots with different emission wavelengths on the surface of the metal thin film can be excited to couple and interact with the metal surface plasmon to emit highly oriented polarized fluorescence on the prism side, whose fluorescence properties are closely related to the sample thickness. Surface plasmon coupling The fluorescence emission method (SPCE) has wavelength-resolving properties, and the different color quantum dots emit at different angles, the longer the emission wavelength is, the smaller the angle is. The free space emission fluorescence spectra of 720nm and 630nm quantum dots overlap, however, SPCE wavelength resolution properties, we change the detection angle to avoid spectral overlap, obtained at the prism side of the 43o and 51o at two kinds of quantum dots SPCE fluorescence peak.Quantum point is the SPCE in the multi-channel, high-throughput detection Ideal for fluorescent species in applications.