Electroless Deposited Gold Nanoparticles on Glass Plates as Sensors for Measuring the Dielectric Constant of Solutions

Abstract

This work describes a method for the deposition of Au nanoparticles on glass plates (Au-glass). An electroless metal plating technique was extended to the Au nanoparticle deposition. The technique consisted of three steps that took place on the glass plate: (1) adsorption of Sn 2+ ions, (2) deposition of metallic Ag nuclei generated by reducing Ag + ions with Sn 2+ ions on the Snadsorbed sites, and (3) deposition of Au nanoparticles by reducing Au + ions on the Ag surface. TEM observation revealed that metallic Au nanoparticles with a size of 34.6 ± 11.5 nm were formed on the glass surface. A surface plasmon resonance absorption peak was observed, and its peak wavelength redshifted by immersing the Au-glass into a solution with a large dielectric constant. The redshift corresponded qualitatively to the calculation by the Mie theory accompanying the Drude expression, which was based on the change of the dielectric constant of the solution. The obtained results indicated that the Au-glass functioned as a sensor for measuring the dielectric constant of the solution.

Tin Sensitization for Electroless Plating Review

“…Commercial importance.-Literature reports indicate that the two-step SnCl 2 and PdCl 2 (Ag or Pt) activation process is used to fabricate monodisperse catalyst, metal monolayers, and to control metal deposition on glass or membranes. [2][3][4][5]35,36 The single-step Sn-Pd complex activation process was developed for convenient operation and is reported to have been used for electroless Cu plating on printed circuit boards. 48,49 The photo selective metal deposition (PSMD) method was developed in 1970s for fabricating metal patterns.…”

Electroless deposition of gold on silicon and its potential applications: review

“…Such technique has been used by different authors to coat a variety of different non-conducting substrates including silica spheres. [27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] The electroless deposited Au nanoparticles can also be used to reduce other metal salts using surface plasmon induced reduction. This technique was demonstrated by reducing both Ag þ and Cu 2þ ions to form a core-shell type structure.…”

Pulsed Electrodeposition of Gold Nanoparticles on Fluorine-Doped Tin Oxide Glass and Absorption-Based Surface Plasmon Resonance Evaluation

“…3b and 3c, average diameter of 30.3 (Samples 2) and 50.7 nm (Samples 3) were obtained. The classical Mie-Drude theory [32] assumes that nanoparticles are dipole oscillators with the extinction cross-section ( ext Q ) being the sum of the absorption cross-section ( abs Q ) and the scattering cross-section ( sca Q ), all correlated according to the following equation:…”

“…R is radius, ε is dielectric function and λ is wavelength of the particle. In the above equation, subscripts p refer to the particle and m refer to the medium material [32].…”