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Enhanced photoluminescence of CdS quantum dots thin films on Cu and Ag nanoparticles

机译：Cds量子点薄膜的Cu和Ag纳米粒子的增强光致发光

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摘要

Fluorescent nanoparticles (NPs) exhibit unique optical properties which are utilized to prepare highly sensitive sensors. This paper illustrates the enhancement of luminescence emission of CdS quantum dots (QDs) from selfassembled metallic NPs of Cu and Ag. Metallic NPs, especially of Cu, Ag and Au exhibit unique and tunable plasmonic properties which are further manipulated by varying their size and shape. In the present study, plasmonic NPs were fabricated on glass substrate heated at 400 degrees C for the conversion of metallic layers into homogeneous NPs so as to create plasmonic response from these uniform NPs. The bimetallic layers of Ag and Cu NPs form a composite material having higher thermal conductivity, higher chemical stability and lower value of thermal expansion than monometallic layer of NPs. The photo-luminescence enhancement of CdS QDs thin films deposited on Cu and Ag NPs would find applications as light emitters and sensing devices. The attachment of CdS QDs on these bimetallic layers was confirmed by studying their optical properties. The morphology of the three prepared samples was analysed by scanning electron microscopy, which confirms the homogeneous deposition of spherical Cu and Ag NPs having size ranging from 20 to 55 nm (approximately). The above obtained outcomes illustrate the localized surface plasmon resonance characteristic of metal NPs which can be applied further for chemical and biological sensing
机译：荧光纳米颗粒（NPS）表现出独特的光学性质，其用于制备高敏感的传感器。本文说明了来自Cu和Ag的自主体金属NPS的CDS量子点（QDS）的发光发射的增强。金属NPS，尤其是Cu，Ag和Au，表现出独特和可调的等离子体性能，通过改变其尺寸和形状来进一步操纵。在本研究中，在400℃加热的玻璃基板上制造等离子体NP，以将金属层转化为均匀的NP，以便从这些均匀NPS产生等离子体反应。 Ag和Cu nps的双金属层形成具有较高导热性，较高的化学稳定性和较低的热膨胀值的复合材料，而不是比单金属膨胀层的NPS。 CDS QDS薄膜的光发光增强沉积在Cu和Ag NPS上的光发光会发现应用作为光发射器和传感装置。通过研究它们的光学性质，确认CDS QD在这些双金属层上的附接。通过扫描电子显微镜分析三种制备样品的形态，其证实球形Cu和Ag NP的均匀沉积，其尺寸为20至55nm（约）。上述结果示出了金属NP的局部表面等离子体共振特性，其可以进一步应用于化学和生物传感

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