The effect of size and shape of gold nanoparticles on thin film properties

Abstract

This work describes the properties of gold nanoparticles (AuNPs) thin film on silicon (Si) substrates. The AuNPs can be divided into two major shapes: gold nanospheres (AuNSs) and gold nanorods (AuNRs). Two sizes of AuNSs (15 nm and 30 nm) and three aspect ratios of AuNRs (3.12, 3.39 and 3.60) were synthesised using the seeding-growth method. The AuNPs produced were deposited on Si substrates by using a spin-coating method followed by heat treatment at 200 C. The number of AuNPs coatings varied as one, three and five coating depositions, respectively. From the field emission scanning electron microscopy, the AuNPs were uniformly distributed on the Si substrate surface. The AuNPs distribution increased with increasing number of AuNPs coating. Various deposited AuNPs with different shapes and sizes were analysed using current-voltage (I-V) measurement in light-dark conditions. The results showed that the resistance of samples became lower under light condition as the number of AuNPs coatings increased on the Si substrate due to the large amount of AuNPs particles, which had better properties in absorbing and scattering the light intensity. Among these samples, five-coating depositions of 15 nm AuNSs and 3.12 aspect ratio of AuNRs thin films gave the best sensitivity in light-dark condition. The higher sensitivity implied the better sensing and recovery properties since it can amplify a small signal from the same light source power/intensity.

Enhancement of Schottky Junction Silicon Solar Cell with CdSe/ZnS Quantum Dots Decorated Metal Nanostructures

“…The solar cell parameters with Au NPs 3 and QDs are mentioned thoroughly in Table 1. As discussed, Au NPs 3 implies the most monodisperse spherical particles and the highest surface coverage on the substrate among three particle sizes, thus contributing significantly to enhancing solar cell performance [35,36]. By measuring the electrical properties of devices, the influence of Au NPs and QDs in the cell's performance is clarified.…”

Extracting structured seed-mediated gold nanorod growth procedures from scientific text with LLMs

“…15 The suitability of a nanoparticle for a particular application depends on its morphology and size, which correspond to different plasmonic properties. 16–18…”

“…15 The suitability of a nanoparticle for a particular application depends on its morphology and size, which correspond to different plasmonic properties. [16][17][18] Despite the popularity of anisotropic gold nanoparticles, systematic investigation of the control of these properties has only recently been approached. 19 Although some theories and models do exist for identifying and explaining the mechanisms of synthesis that determine nanoparticle morphology, 4,[20][21][22] most synthesis exploration is still guided by heuristics based on domain knowledge.…”

Deposition of gold nanoparticles on titanium nanopits

“…Subsequently, it is possible to deposit the gold nanoparticles from their precursor by photodeposition or spin-coating method and finally, obtain the titanium matrix with the nanoparticles. The shape of gold nanoparticles depends on the experiment condition, but it is possible to obtain the triangle structures of gold (Carville, Neumayer, Manzo, Gallo, & Rodriguez, 2016;Ng, Razak, Aziz, & Cheong, 2014).…”