A Simple and Sensitive SPRS Method for Trace H2O2 Based on the TiO2+ Complex and Gold Nanoparticles Aggregation Reactions

Abstract

In the medium of H 2 SO 4 and in the presence of TiO 2+ , gold nanoparticles in size of 10 nm exhibited a weak surface plasmon resonance scattering (SPRS) peak at 775 nm. Upon addition of trace H 2 O 2 , the yellow complex [TiO(H 2 O 2 )] 2+ formed that cause the gold nanoparticles aggregations to form bigger gold nanoparticle clusters in size of about 900 nm, and the SPRS intensity at 775 nm (I) enhanced greatly. The enhanced intensity ΔI was linear to the H 2 O 2 concentration in the range of 0.025-48.7 μg/mL, with a detection limit of 0.014 μg/mL H 2 O 2 . This SPRS method was applied to determining H 2 O 2 in water samples with satisfactory results.

Template-free formation of vertically oriented TiO2 nanorods with uniform distribution for organics-sensing application

“…3) also demonstrate the grain growth. Other works confirmed the anatase TiO 2 after thermal treatment at 400-500 • C had a higher photoactivity, while the photoactivity decreased due to the sharp drop of the specific surface area after thermal treatment at higher temperature [30][31][32][33][34][35][36][37][38][39][40][41][42]. The other contribution to the higher photocurrent was ascribed to the mixed crystal effect because of the band match between anatase and rutile crystals.…”

“…The color of the solution also changed slowly from colorless to yellow after the oxidation began, and then faded to colorless again at the end of the reaction. The color came from the formation of the complex [TiO(H 2 O 2 )] 2+ [37], and its disappearance resulted from the decomposition of the complex caused by forming TiO 2 precipitation with higher stability. Fig.…”

Analytical Studies Of Titanium Oxyhydroxide/Manganese Oxide Elaborated on Pure Copper Electrode: Influence of the Composite on the Electrochemical Behavior of the Substrate in 3% NaCl Medium

“…Step 1: formation of peroxo-titanium complex As soon as hydrogen peroxide H 2 O 2 is added to the white powder of titanium oxysulphate TiOSO 4 , an orange color appears immediately characteristic of peroxo-titanium complex TiO 2 SO 4 formation [13,14].…”

Resonance light scattering determination of trace bisphenol A with signal amplification by aptamer–nanogold catalysis

“…Resonance light scattering (RLS) is a simple and sensitive technique used to analyze trace metal ions, protein and nucleic acids, based on associated, chelated, redox, metal ion and enzyme catalytic particle reactions . However, selectivity was not high in most of them, and complicated samples can not be analyzed.…”