In Situ Localized Surface Plasmon Resonance (LSPR) Spectroscopy to Investigate Kinetics of Chemical Bath Deposition of CdS Thin Films

Abstract

Techniques that can characterize the early stages of thin film deposition from liquid phase processes can aid greatly in our understanding of mechanistic aspects of chemical bath deposition (CBD).Here we have used localized surface plasmon resonance (LSPR) spectroscopy to monitor in-situ the kinetics of early-stage growth of cadmium sulfide (CdS) thin films on Ag nanoparticle on quartz substrates. Real-time shift during CdS deposition showed that the LSPR wavelength red shifted rapidly due to random deposition of CdS on the substrate, but saturated at longer times. modeling showed that these features could be interpreted as an initial deposition of CdS islands followed by preferential deposition onto itself. The CdS also showed significantly enhanced Raman signals up to 170 times due to surface enhanced raman scattering (SERS) from the CdS/Ag NP regions. The ex-situ SERS effect supported the LSPR shift suggesting that these techniques could be used to understand nucleation and growth phenomena from the liquid phase.

Formation of laterally-oriented monolayers of plasmonic silver nanoplats and their ensembles with cadmium selenide quantum dots on the sur face of thin polymeric film

“…Согласно литературным данным, величина длинноволнового сдвига может быть оценена теоретически в модели, учитывающей показатель преломления дисперсионной среды и электрическую проводимость монослоя молекул [6]. [7]. В спектрах фотолюминесценции водного коллоидного раствора КТ имеется интенсивная полоса в области λ ≈ 561 нм, соответствующая излучательной рекомбинации оптически возбужденных экситонов в КТ.…”

Investigation of Flow Rate on Chemical Bath Deposition of Silver Films Inside Hollow Polymer Cylinders

“…Indeed, recently in-situ investigations have utilized Ag LSPR to monitor the deposition of thin films. 31…”

Label-free and specific detection of soluble programmed death ligand-1 using a localized surface plasmon resonance biosensor based on excessively tilted fiber gratings

“…In the last decades, localized surface Plasmon resonance (LSPR) sensors have attracted great attention in biological, chemical, and environmental monitoring fields because of their high sensitivity to the surrounding refractive index (SRI) [12,13]. Unlike the surface Plasmon resonance (SPR) platform where light is radiated on the surface of a continuous metal film [14], the extinction of LSPR is caused by the absorption and scattering of light using metal nanoparticles, where the surface Plasmon polaritons are confined near the nanostructure [15].…”