Grapheme-modified Pt electrode and method for detecting trace amount heavy metal
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A technology of graphene and heavy metal ions, applied in the direction of material electrochemical variables, can solve the problems of poor reproducibility, achieve the effects of prolonging service life, reducing background noise, and improving detection speed
Active Publication Date: 2012-08-01
SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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(4) The operation is strict and the reproducibility is poor
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Embodiment 1
[0043] Embodiment 1 The making of graphene-modified platinum electrode
[0044] 1) Silicon oxidation
[0045] a. Clean silicon wafer
[0046] First place the wafer in 30% H 2 o 2 and H 2 SO 4 Configure the cleaning solution in a volume ratio of 1:5, heat it in an electric furnace for 20 minutes, clean it with deionized water after cooling, then blow dry it with nitrogen, and finally bake it in an oven at 120°C for 30 minutes to remove water. steam.
[0047] b. Oxidation to form silica
[0048] Growth of SiO on silicon surface 2 The methods generally include chemical vapor deposition and thermal oxidation. The equipment for chemical vapor deposition of oxides is relatively expensive, and the production cost of producing oxide layers is relatively high, and it is usually used when low temperatures are required. The manufacturing cost of thermal oxidation is relatively low, but the structure must be able to withstand high temperature treatment, silicon thermal oxidation ...
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Abstract
The invention relates to a grapheme-modified platinum electrode. The grapheme-modified platinum electrode is formed by oxidizing a platinum electrode on a silicon chip to generate a carbon dioxide layer for serving as a substrate, evaporating a metal platinum electrode on the carbon dioxide substrate and growing grapheme on the platinum electrode. A stripping voltammetry method is adopted, the grapheme-modified platinum electrode manufactured with an MEMS (Micro-electromechanical System) is taken as a working electrode, an Ag/AgCl electrode is taken as a reference ratio electrode, a platinum wire electrode is taken as a counter electrode, parameter selection of post-treatment, enriching time, potential setting, stripping voltammetry are performed, the heavy metal extreme value is 0.05 mg/L according to detection, and a provided G/Pt electrode has remarkably higher detection sensitivity than a naked Pt electrode.
Description
technical field [0001] The invention relates to a graphene-modified Pt electrode (G / Pt) and a method for detecting trace heavy metals, and is an electrochemical sensor for on-site detection of multiple heavy metals. It belongs to the field of electrochemical sensors. Background technique [0002] Heavy metal refers to the atomic density greater than 5g / cm 3 There are about 45 kinds of metal elements, such as copper, lead, zinc, cadmium, manganese, iron, cobalt, nickel, vanadium, mercury, gold, silver and so on. Although heavy metals such as manganese, copper, and zinc are trace elements needed for life activities, most heavy metals such as lead, cadmium, nickel, etc. are not necessary for life activities, and when these substances exceed a certain concentration, they will cause harm to the human body. At present, there are mainly the following methods for detecting heavy metals: atomic fluorescence spectrometry (AFS), inductively coupled plasma mass spectrometry (ICP-MS), ...
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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/30G01N27/48
Inventor 金庆辉唐逢杰丁古巧张洹千张凤谢晓明赵建龙
Owner SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
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