High Hydrogen Ion Concentration Causes a Blue Shift in Gold Nanoparticles

Pei-Yi Lin ,Chien-Jung Huang,Po‐Chen Lin

doi:10.3390/cryst11020132

Abstract

In this research, our team used a rare electrochemical method to obtain gold nanoparticles (GNPs). The growth solution has been added with nitric acid in order to observe the effect of GNPs. The solution also included cetyltrimethylammonium bromide (CTAB) and acetone. All reactions involved the oxidation of acetone and chain polymerization. Therefore, the GNPs changed to a su pramolecular structure. In addition, our team measured absorption wavelength via ultraviolet/ visible spectrophotometer and found an obviously blue shift. This short absorption wavelength is obviously different from other GNPs.

Highlights

In the past decade, nanotechnology has been extensively studied because of the unique characteristics of nanoparticles
This study focuses on gold nanoparticles (GNPs)
Crystals 2021, 11, 132 (c) The GNPs in powder form can be obtained using the following steps: (i) After adding toluene into the product solution and centrifuging at 12,000 rpm for 30 min, the interface separation (GNPs, toluene, and surfactant, from bottom to top) is accomplished; (ii) nanoparticles can be acquired through drying in an electric oven at 100 ◦C for three days, after extracting the cetyltrimethylammonium bromide (CTAB) solution that forms as a surfactant in the interlayer

Summary

Introduction

Nanotechnology has been extensively studied because of the unique characteristics of nanoparticles. This study focuses on gold nanoparticles (GNPs). When electrolysis is performed electrochemically, the bulk metal of the anode is oxidized and produces metal ions; these metal ions will migrate to the cathode, and the cathode will perform reduction and form atoms on the surface of the cathode. These atoms will be coated with a surfactant to form nanoparticles. The molecules that interact with each other will gather to form a micelle template to control the size and shape of the nanoparticles [15,16]. This study mainly explores the effect of strong acids on gold nanoparticles. This study expects that short-wavelength GNPs can make a greater contribution to solar cells

Experimental Process and Method

Measurement and Calculation of GNPs’ Characteristics

Result and Discussion