Synthesis of Cu nanoparticles-loaded Fe3O4@carbon core–shell nanocomposite and its application for electrochemical sensing of hydrogen peroxide

2014 ◽  
Vol 730 ◽  
pp. 10-15 ◽  
Author(s):  
Mingying Zhang ◽  
Qinglin Sheng ◽  
Fei Nie ◽  
Jianbin Zheng
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Sensing ◽  
Core Shell ◽  
Cu Nanoparticles ◽  
Carbon Core

scholarly journals Peroxidase-like activity of Fe3O4/carbon core-shell nanostructured : effects of carbon shell thickness for application to glucose biosensor

2021 ◽  
Vol 10 (2) ◽  
pp. 109-113
Author(s):  
Nghia Nguyen Duc ◽  
Chinh Huynh Dang ◽  
Hoang Tran Vinh ◽  
Vu Dao Hong
Keyword(s):  
Hydrogen Peroxide ◽  
High Selectivity ◽  
Glucose Biosensor ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Blue Color ◽  
Carbon Coated ◽  
Peroxidase Enzyme ◽  
Enzymatic Biosensor ◽  
Carbon Core

In this study, we present a protocol for synthesis of carbon coated Fe3O4 nanoparticles with core-shell structured nanocomposite (FeC) following a two steps approach. The peroxidase-like acitivity of the synthesized FeC nanocomposite has been evaluated towards replacing of the horseradish peroxidase enzyme (HRP) in hydrogen peroxide enzymatic biosensor. In which, FeC has catalyzed for a redox reaction 5,5'-tetramethylbenzidine (TMB) and H2O2 to produce oxidized state of TMB with as a blue color. Results exhibited that FeC has a high catalytic activity accepting for fabrication of a high selectivity hydrogen peroxide (H2O2) colorimetric sensor with low detection of limit (LoD) of 0.02 mM H2O2. Based on this finding, we have used FeC and combined with glucose oxidase (GOx) enzyme to construct a new colorimetric glucose biosensor with high selectivity. 

scholarly journals Facile Synthesis of Carboxymethyl Cellulose Coated Core/Shell SiO2@Cu Nanoparticles and Their Antifungal Activity against Phytophthora capsici

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 888
Author(s):  
Nguyen Thi Thanh Hai ◽  
Nguyen Duc Cuong ◽  
Nguyen Tran Quyen ◽  
Nguyen Quoc Hien ◽  
Tran Thi Dieu Hien ◽  
...  
Keyword(s):  
Antifungal Activity ◽  
Carboxymethyl Cellulose ◽  
Chemical Reduction ◽  
Low Cost ◽  
Phytophthora Capsici ◽  
Reduction Process ◽  
Spherical Shape ◽  
Core Shell ◽  
Cu Nanoparticles ◽  
Average Size

Cu nanoparticles are a potential material for creating novel alternative antimicrobial products due to their unique antibacterial/antifungal properties, stability, dispersion, low cost and abundance as well as being economical and ecofriendly. In this work, carboxymethyl cellulose coated core/shell SiO2@Cu nanoparticles (NPs) were synthesized by a simple and effective chemical reduction process. The initial SiO2 NPs, which were prepared from rice husk ash, were coated by a copper ultrathin film using hydrazine and carboxymethyl cellulose (CMC) as reducing agent and stable agent, respectively. The core/shell SiO2@Cu nanoparticles with an average size of ~19 nm were surrounded by CMC. The results indicated that the SiO2@Cu@CMC suspension was a homogenous morphology with a spherical shape, regular dispersion and good stability. Furthermore, the multicomponent SiO2@Cu@CMC NPs showed good antifungal activity against Phytophthora capsici (P. capsici). The novel Cu NPs-based multicomponent suspension is a key compound in the development of new fungicides for the control of the Phytophthora disease.

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