Electrodeposition of gold nanoparticles on ITO: Control of morphology and plasmon resonance-based absorption and scattering

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 628; no. 1; pp. 7 - 15
• Main Authors: Sakai, Nobuyuki, Fujiwara, Yusuke, Arai, Michio, Yu, Kefeng, Tatsuma, Tetsu
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 01.04.2009; Elsevier
• Subjects: Chemistry; Electrochemical deposition; Electrochemistry; Electrodeposition; Exact sciences and technology; General and physical chemistry; Gold nanoparticles and nanostructures; ITO electrodes; Localized surface plasmon resonance; LSPR sensor; Study of interfaces; Electrochemical deposition; ITO electrodes; Localized surface plasmon resonance; Gold nanoparticles and nanostructures; LSPR sensor; Atomic force microscopy; Gold; Cysteine; Indium tin oxide electrode; Scattering spectrometry; Nanoparticle; Refraction index; Visible spectrometry; Transition metal; Nanostructure; Surface structure; Sulfur containing aminoacid; Absorption spectrometry; Adsorption; Morphology; Electrodeposition; Surface plasmon resonance; Electrochemical reaction
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2008.12.008

Gold nanoparticles and nanostructures were electrodeposited on transparent ITO electrodes in the presence of l-cysteine. When the deposition potential was shifted from −0.5 V (vs. Ag|AgCl) to 0.0 V (deposition time: 60 s), the gold nanoparticles changed from spheres to larger and bumpy structures, resulting in a redshift of the absorption peak based on localized surface plasmon resonance (LSPR) from 630 nm to 710 nm. Prolonged deposition at −0.5 V increased the size as well as the absorption and scattering of the spherical nanoparticles. At 0.0 V, elongated deposition increased the size of the bumpy nanoparticles, and finally yielded more complicated three-dimensional structures including dendritic structures, which gave low scattering and intense absorption. The electrodeposited gold nanoparticles were applied to a LSPR sensor for refractive index with controllable working wavelength and sensitivity.