A Highly Sensitive SERS and RRS Coupled Di-Mode Method for CO Detection Using Nanogolds as Catalysts and Bifunctional Probes.

Dongmei Yao,Lingbo Gong,Zhiliang Jiang,Aihui Liang,Chongning Li,Guiqing Wen

doi:10.3390/nano10030450

Dongmei Yao, Lingbo Gong + Show 4 more

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https://doi.org/10.3390/nano10030450

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Journal: Nanomaterials	Publication Date: Mar 2, 2020
Citations: 8	License type: CC BY 4.0

Affiliation: Hechi University, Guangxi Normal University

Abstract

Carbon monoxide (CO) is a commonly poisonous gas. It is important to detect CO in daily life. Herein, a new and sensitive surface enhanced Raman scattering (SERS) and resonance Rayleigh scattering (RRS) coupled di-mode method was developed for CO, based on gold nano-enzyme catalysis and gold nanoprobes. CO can react with HAuCl4 to generate gold nanoparticles (AuNPs) in pH 5.2 HAc-NaAc buffer. The generated AuNPs exhibited SERS activity at 1620 cm−1 in the presence of Vitoria blue B (VBB) molecular probes, and an RRS peak at 290 nm. Based on the AuNP bifunctional probes, the increased SERS and RRS intensities respond linearly with the concentration of CO in the range of 100–1500 ng/mL and 30–5230 ng/mL, respectively. To improve the sensitivity, the produced AuNPs were used as nano-enzyme catalysts for the new indicator reaction of HAuCl4-ethanol (En) to amplify the signal. The sensitive SERS method was coupled with the accurate RRS method to develop a sensitive and accurate SERS/RRS di-mode method for determination of 3.0–413 ng/mL CO, based on the AuNP-HAuCl4-En nanocatalytic reaction and its product of AuNPs as SERS and RRS bifunctional probes.

Highlights

The progress and continuity of metabolic and genetic information transmission in life-sustaining activities are closely related to the orderly chemical reactions in vivo, and enzymes are the key to catalyzing these chemical reactions to proceed smoothly
This paper studied the nano-catalytic reaction of Carbon monoxide (CO)-HAuCl4-En, and established a new surface enhanced Raman scattering (SERS)/resonance Rayleigh scattering (RRS) coupled di-mode method for trace CO
The inelastic scattering intensity can be ignored when compared with the Rayleigh scattering

Summary

Introduction

The progress and continuity of metabolic and genetic information transmission in life-sustaining activities are closely related to the orderly chemical reactions in vivo, and enzymes are the key to catalyzing these chemical reactions to proceed smoothly. Nano-enzymes have the characteristics of high catalytic efficiency, stability, economy and large-scale preparation. They have been applied in medicine, chemical industry, food, agriculture, environment and analytical chemistry. The common problem of these mimetic enzymes is that their catalytic activity and selectivity are low, and their preparation cost is high. These mimetic enzymes can not meet the actual needs. How to skillfully combine the catalytic activity of nano-enzymes with their physical and chemical properties to create more unique new functions will be a new subject to be studied. Based on the catalysis of immune nanoprobes and aptamer nanoprobes, they are used in resonance Rayleigh scattering (RRS) and surface enhanced Raman scattering (SERS) quantitative analyses, respectively [11,12]

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