scholarly journals Size Effects of Pt Nanoparticle/Graphene Composite Materials on the Electrochemical Sensing of Hydrogen Peroxide

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Chia-Liang Sun ◽  
Jheng-Sin Su ◽  
Shun-Yi Lai ◽  
Yu-Jen Lu
Keyword(s):  
Hydrogen Peroxide ◽  
Pt Nanoparticles ◽  
Electrochemical Measurement ◽  
Electrochemical Sensing ◽  
Cyclic Voltammogram ◽  
Pt Nanoparticle ◽  
Size Dependent ◽  
Measurement Results ◽  
Reduction Current ◽  
The Mean

The electrochemical detection of hydrogen peroxide (H2O2) has attracted much attention recently. Meanwhile, the size of nanoparticles which significantly influences electrocatalytic activity is crucial for electrocatalysts. Hence, we prepared five different size-selected Pt/graphene-modified glassy carbon (GC) electrodes to characterize H2O2level via electrochemical measurements. During the preparation of the nanocomposites, size-selected Pt nanoparticles (NPs) with the mean diameter of 1.3, 1.7, 2.9, and 4.3 nm were assembled onto the graphene surfaces. The electrochemical measurement results are size-dependent for Pt NPs when sensing H2O2. When all cyclic voltammogram results from various electrodes are compared, the Pt-1.7 nm/G-modified GC electrode has the highest reduction current, the best detection limit, and the best sensitivity.

Novel synthesis of chitosan protected platinum nanoparticles based on gas–liquid interfacial reactions and their application for electrochemical sensing of hydrogen peroxide

2016 ◽  
Vol 8 (44) ◽  
pp. 7903-7909 ◽  
Author(s):  
Jianbo Liu ◽  
Wushuang Bai ◽  
Juncai Zhang ◽  
Jianbin Zheng
Keyword(s):  
Hydrogen Peroxide ◽  
Platinum Nanoparticles ◽  
Pt Nanoparticles ◽  
Interfacial Reactions ◽  
Electrochemical Sensing ◽  
Controllable Synthesis ◽  
Novel Synthesis ◽  
Liquid Reaction

A gas–liquid reaction was proposed for the controllable synthesis of Pt nanoparticles, which exhibited uniform morphology without any aggregation.

Mild and Low-Cost Synthetic Process for Monodispersive Platinum Nanoparitcles on Carbon Aerogel

2014 ◽  
Vol 809-810 ◽  
pp. 53-58
Author(s):  
Feng Li ◽  
Gao Yang Zhao ◽  
Ying Yang ◽  
Gary Pattrick ◽  
Richard Moutloali
Keyword(s):  
Low Cost ◽  
Pt Nanoparticles ◽  
Electrochemical Measurement ◽  
Carbon Aerogel ◽  
Reduction Reaction ◽  
Narrow Particle Size Distribution ◽  
Synthetic Process ◽  
Transmission Electron ◽  
Measurement Results ◽  
Mean Size

A mild synthetic process using formic acid as the reduction agent was applied to prepare 40 wt% Pt/carbon aerogel (CA) electrocatalyst. The as-prepared sample was characterized by transmission electron microscopy (TEM) and electrochemical measurements. The results exhibit Pt nanoparticles with narrow particle size distribution are dispersed throughout carbon aerogel structure. Moreover, the Pt/CA catalyst has smaller Pt nanoparticle mean size than Johnson Matthey HiSpecTM 4000 (JM4000). The electrochemical measurement results indicate that the Pt/CA catalyst with Pt loading of 40 wt% possesses similar electrochemical surface area (ESA) value and oxygen reduction reaction (ORR) activity as JM4000.

scholarly journals Paper-Based Competitive Immunochromatography Coupled with an Enzyme-Modified Electrode to Enable the Wireless Monitoring and Electrochemical Sensing of Cotinine in Urine

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1659
Author(s):  
Nutcha Larpant ◽  
Pramod K. Kalambate ◽  
Tautgirdas Ruzgas ◽  
Wanida Laiwattanapaisal
Keyword(s):  
Glucose Oxidase ◽  
Modified Electrode ◽  
Near Field ◽  
Electrochemical Measurement ◽  
Electrochemical Sensing ◽  
Urine Samples ◽  
Lateral Flow Strip ◽  
Wireless Monitoring ◽  
Sensing Platform ◽  
Combined Strategy

This paper proposes a combined strategy of using paper-based competitive immunochromatography and a near field communication (NFC) tag for wireless cotinine determination. The glucose oxidase labeled cotinine antibody specifically binds free cotinine in a sample, whereas the unoccupied antibody attached to BSA-cotinine at the test line on a lateral flow strip. The glucose oxidase on the strip and an assistant pad in the presence of glucose generated H2O2 and imposed the Ag oxidation on the modified electrode. This enabled monitoring of immunoreaction by either electrochemical measurement or wireless detection. Wireless sensing was realized for cotinine in the range of 100–1000 ng/mL (R2 = 0.96) in PBS medium. Undiluted urine samples from non-smokers exhibited an Ag-oxidation rate three times higher than the smoker’s urine samples. For 1:8 diluted urine samples (smokers), the proposed paper-based competitive immunochromatography coupled with an enzyme-modified electrode differentiated positive and negative samples and exhibited cotinine discrimination at levels higher than 12 ng/mL. This novel sensing platform can potentially be combined with a smartphone as a reader unit.

Size-Dependent Variation in the Evasive Behaviour of the Bivalve Mollusc Spisula Solidissima

1979 ◽  
Vol 78 (1) ◽  
pp. 59-75
Author(s):  
DAVID J. PRIOR ◽  
ANNE M. SCHNEIDERMAN ◽  
SHARON I. GREENE
Keyword(s):  
Receptive Fields ◽  
Bivalve Mollusc ◽  
Spisula Solidissima ◽  
Visceral Ganglion ◽  
Size Dependent ◽  
Boston University ◽  
Asterias Forbesi ◽  
The Mean ◽  
The Individual ◽  
Tube Feet

1. The evasive jump response of Spisula can be elicited by contact of the siphons with the tube feet of a starfish (Asterias forbesi). 2. The level of responsiveness varies with the size of the individual clam; small clams (2.0-5.0 cm) being very responsive, large clams (12.0-18.0 cm) being totally unresponsive. 3. The cell bodies of touch-sensitive neurones subserving the siphons are located in the visceral ganglion. The mean area of the receptive fields of these neurones in small clams is 33.8 mm2 and in large clams is 9.7 mm2. 4. In small clams the large proportion of the total siphon surface innervated by single touch-sensitive neurones results in considerable overlap of receptive fields. As a result of this overlap, numerous touch-sensitive neurones are activated by a point stimulus. 5. The variation in jump responsiveness of large and small clams is correlated with the size of the receptive fields of touch-sensitive neurones. Note: Present address: Department of Zoology, University of California, Berkeley, CA 04720. Present address: Boston University Marine Program, Woods Hole, MA 02543.

Development of Au-Pd@UiO-66-on-ZIF-L/CC as a self-supported electrochemical sensor for in situ monitoring of cellular hydrogen peroxide

2021 ◽  
Author(s):  
Jilin Zheng ◽  
Peng Zhao ◽  
Shiying Zhou ◽  
Sha Chen ◽  
Yi Liang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Electrochemical Sensor ◽  
Noble Metals ◽  
Electrochemical Sensors ◽  
Metal Organic Frameworks ◽  
Electrochemical Sensing ◽  
In Situ Monitoring ◽  
Metal Organic

Integrating metal-organic frameworks (MOFs) of different components or structures together and exploiting them as electrochemical sensors for electrochemical sensing have aroused great interest. And the incorporation of noble metals with...

A facile synthesis of novel polyaniline/graphene nanocomposite thin films for enzyme-free electrochemical sensing of hydrogen peroxide

2021 ◽  
Author(s):  
Swati Verma ◽  
Dipendra Singh Mal ◽  
Paulo R. Oliveira ◽  
Bruno Campos Janegitz ◽  
Jai Prakash ◽  
...  
Keyword(s):  
Thin Films ◽  
Hydrogen Peroxide ◽  
Small Molecules ◽  
Present Article ◽  
Electrochemical Method ◽  
Electrochemical Sensing ◽  
Facile Synthesis ◽  
Nanocomposite Thin Films ◽  
Graphene Nanocomposite

Electrochemical method is the most effective, facile, and economical approach for the detection of small molecules. The present article deals with design and engineering of polymer-graphene based thin films through...

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