双金属片
抗坏血酸
纳米材料
氧化铟锡
催化作用
检出限
纳米颗粒
材料科学
钯
纳米材料基催化剂
化学工程
化学
纳米技术
核化学
无机化学
薄膜
有机化学
色谱法
食品科学
工程类
作者
Ridge Chavalala,Philani Mashazi
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2022-12-28
卷期号:6 (1): 190-199
被引量:1
标识
DOI:10.1021/acsanm.2c04234
摘要
Nanomaterials of gold and palladium have received research attention due to their excellent catalytic properties. Their recovery after the catalytic reaction still remains a challenge rendering the catalytic application of these nanomaterials for single use. Herein, we report a method of fabricating nanomaterials as thin nanoparticle (NP) films on catalytically inert surfaces, while allowing for their recovery and reuse is investigated. Indium tin oxide (ITO) glass slides were first hydroxylated (ITO-OH) and used to attach the silica NPs (SiO2NPs) to form ITO-SiO2NPs. The ITO-SiO2NPs surface was used as an adsorbent for gold and palladium mono- and bimetallic NPs (Au/PdNPs) to form ITO-SiO2-prS-Au/PdNPs, which was evaluated for the enzyme-like catalytic activity. The fabricated film with bimetallic NPs, ITO-SiO2-prS-Au/PdNPs, exhibited excellent peroxidase-like activity for the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) with H2O2 when compared with monometallic thin NP films, ITO-SiO2-prS-AuNPs, and ITO-SiO2-prS-PdNPs. A typical Michaelis–Menten enzyme-like behavior of the bimetallic NP film, ITO-SiO2-prS-Au/PdNPs, was observed for H2O2 and TMB with Michaelis–Menten constants (Km) of 0.33 and 3.46 mM, respectively. A simple, sensitive, and selective colorimetric assay for ascorbic acid (AA) detection was fabricated based on the reduction effect of AA on the oxidized TMB. The fabricated AA colorimetric sensor exhibited a good linear range from 0.50 to 30.0 μM, with the limit of detection of 0.50 μM and the limit of quantification of 1.65 μM. Finally, our proposed colorimetric sensor, ITO-SiO2-prS-Au/PdNPs, successfully detected AA in new-born calf serum samples, as a real sample representative.
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