Gold Nanoparticle Embedded Titanium Dioxide Thin Film for Surface Plasmon Resonance Gas Sensing at Room Temperature
نویسندگان
چکیده
The optical gas sensing properties of gold (Au) nanoparticles (NPs) doped into titanium dioxide (TiO2 matrix prepared by sol–gel method and annealed at different temperatures have been investigated. AFM images reveal that the Au NPs are exuded from the film during annealing. The chemical interaction of the hydrogen (H2 and carbon monoxide (CO) molecules on the Au surface will increase the overall electron concentration on the metal side, cause a decrease in Au metal bulk plasma wavelength, and the surface plasmon resonance (SPR) peak can be used for the realization of a gas sensor with tunable sensitivity. The plasmonic responses are observed to be sensitive toward the presence of target gases. The results reveal that on decorating the Au NPs at the room temperature gas adsorption can be made possible due to the presence of Au NPs. We estimate that this kind of Au-NPs embedded in TiO2 film can be a promising material for nanophotonic and electrochemical sensor applications.
منابع مشابه
Improving Electrochromic Properties of WO3 Thin Film with Gold Nanoparticle Additive
In this research, WO3 and Au-WO3 thin films were prepared at different temperatures using the sol gel method. The effect of gold nanoparticles (GNPs) on the electrochromic properties of WO3 was also studied. 2.5 nm GNP was synthesized through sodium citrate reduction of gold chloride in an aqueous solution. These films were characterized by XRD, SEM, TEM, and spectrophotometer analyses. The fil...
متن کاملHydrogen sensing by localized surface plasmon resonance in colloidal solutions of Au-WO3-Pd
Nowadays, hydrogen has attracted significant attention as a next generation clean energy source. Hydrogen is highly flammable, so detection of hydrogen gas is required. Gold nanoparticle based localized surface plasmon resonance (LSPR) is an advanced and powerful sensing technique, which is well known for its high sensitivity to surrounding refractive index change in the local environment. We p...
متن کاملOptimization of Sensitivity and Stability of Gold/Silver bi-Layer Thin Films Used in Surface Plasmon Resonance Chips
The aim of this study is experimental assay of sensitivity and stability of a bimetallic silver/gold SPR sensor chip. This chip utilizes the sensitivity of the silver and the stability of the gold. Moreover, the Silver layer (instead of usual Cr or Ti layer) was used as an adhesive intermediate layer between the Gold layer and the glass substrate. The optimization of the Gold/Silver thickness u...
متن کاملEnhanced surface plasmon resonance detection using porous ITO–gold hybrid substrates
We demonstrated enhanced surface plasmon resonance (SPR) detection by incorporating an indium tin oxide (ITO) layer on a thin gold film. Porous ITO layers were fabricated by e-beam evaporation and slanted deposition at room temperature and the ITO structure was optimized in terms of the surface roughness and the SPR curve characteristics. In sensing experiments, the results obtained by ethanol–...
متن کاملSelf-assembled heterosupramolecular visible light photocatalyst consisting of gold nanoparticle-loaded titanium(IV) dioxide and surfactant.
Au nanoparticle surface plasmon resonance-induced photocatalytic chemoselective oxidation of alcohols to carbonyl compounds has been investigated. The heterosupramolecular system consisting of Au nanoparticle-loaded titanium(IV) dioxide and surfactant molecular assembly dramatically enhances the reaction. This system should evolve the photocatalyst to intelligent nanodevices.
متن کامل