Surface Observation for Seed-mediated Growth Attachment of Gold Nanoparticles on a Glassy Carbon Substrate

Abstract

A seed-mediated growth method for surface modification was applied to the attachment of gold nanoparticles (AuNPs) to glassy carbon (GC) surfaces. By simply immersing a GC plate at first into a seed solution containing 4 nm Au nano-seed particles and then into a growth solution containing HAuCl4, ascorbic acid and cetyltrimethyammonium bromide, AuNPs could be successfully attached to the GC surface via the growth of nanoparticles. A possible control of the size and density of AuNPs on GC was examined by observing surface images with a field-emission scanning electron microscope (FE-SEM) after several preparations with different immersion times. Compared with previous results on the growth of AuNPs on indium tin oxide (ITO) surfaces, it was characteristic that the AuNPs attached to GC surfaces exhibited smaller size and higher density as well as a flatter and non-crystal-like morphology. In addition, for performing the dense attachment of regular nano-sized AuNPs on GC surfaces, immersion for 2 h into the growth solution was sufficient. Longer immersion for 24 h caused an irregular growth of bold Au micro-crystals, while 24 h was necessary in the case of AuNPs on ITO surfaces. Shorter seeding and growth times were found to be effective for a sparse attachment of smaller Au nanoparticles whose size was ca. 20 nm. It was clarified that the seed-mediated growth method for surface modification was valid for fabricating a nanointerface composed of AuNPs on GC surfaces.

Gold nanoparticles/graphene oxide/polyaniline nanocomposites film as sensitive LSPR-based sensor for Pb(II) ions detection

“…The AuNPs were fabricated upon ITO substrates using seedmediated growth technique [7]. Briefly, the ITO was first soaked in an Au seed solution containing 0.5 ml of 0.01 M HAuCl 4 , 0.5 ml of 0.01 M trisodium citrate, and 20 ml deionized water.…”

Preparation and characterization of nanostructured thin films of Au and Ag nanoparticles synthesized by ascorbic acid on modified glass surface

“…In the present investigation, ascorbic acid was used for reduction of HAuCl 4 and AgNO 3 to gold and silver nanoparticles in the presence of an appropriate stabilizer and at ambient temperature. The microscopic characterization of the prepared Au and AgNPs exhibits that this approach capable synthesis nanoparticles with specific size and shape by controlling the experimental conditions, as illustrated in the representative transmission electron microscopy images in Fig.…”

“…[1][2][3] Attaching a nanostructure on surfaces and interfaces has been attracting active attention in materials chemistry and nanotechnology, which can be developed in highly sensitive, cost-effective, miniature sensors. [4,5] Gold and silver nanoparticles (Au and AgNPs) have distinctive physical and chemical properties that can be of great utility in creating novel recognition and transduction processes for chemical and biological sensors. [6,7] Because of cheap and simple preparation, Au and Ag colloid solutions are mostly used in sensing methods.…”

Paper supports in electrocatalysis: Weak contact catalysis with seed-mediated grown gold nanoparticle deposits

“…With the seed-mediated growth method AuNPs can be attached and grown on ITO substrates [18] as well as GC substrates [19]. The successful attachment of AuNPs to paper materials was confirmed by the characteristic coloration.…”