Substrate Temperature Effect on Microstructure, Optical, and Glucose Sensing Characteristics of Pulsed Laser Deposited Silver Nanoparticles
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This work reports the substrate temperature-influenced change in the structural, morphological, optical, and glucose sensing properties of silver (Ag) nanoparticles (NPs) deposited on p-type Si (100) wafers. AgNP films grown at temperatures ranging from RT to 600 °C clearly show a dependence of orientation texture and surface morphology on substrate temperature (T s). As T s increases from RT towards 600 °C, the preferred orientation of AgNP film changes from (111) to (200). The AgNPs size, that is T s-dependent, reaches the maximum value at T s = 300 °C. This result is attributed to restructuring of AgNPs texture. Moreover, the AgNP shape also changes from ellipsoid to sphere as T s increases from RT to 600 °C. Surface plasmon enhancement in photoluminescence intensity is observed with increase in T s. It is found also that the AgNP film deposited at 300 °C has considerable reflectance reduction relative to the silicon substrate, in wavelength range of 300–800 nm and a progressive red shift of localized surface plasmon resonances caused by the adding of increasing quantities of glucose has been observed. As a proof of concept, we also demonstrate the capability of grown AgNP substrates for glucose detection based on surface enhanced Raman spectroscopy in physiological concentration range with short integration time 10 s, varying with T s.
KeywordsSurface plasmon resonance AgNP thin film Glucose sensing
This study has been partially funded by the following: (i) the Portuguese Foundation for Science and Technology (FCT) under the project PTDC/FIS/098943/2008, strategic projects PEST-C/FIS/UI0607/2011 and UID/FIS/04650/2013; (ii) the European COST Actions MP0901-NanoTP and MP0903-NanoAlloy. The author J.P.B.S. is grateful for financial support through the FCT grants SFRH/BPD/92896/2013. The author KCS acknowledges UGC, New Delhi, for the startup grant (F.4-5(59-FRP)/2014(BSR)). The authors would also like to thank Engineer José Santos for technical support at Thin Film Laboratory.
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