scholarly journals Electroanalytical detection of pindolol: comparison of unmodified and reduced graphene oxide modified screen-printed graphite electrodes

The Analyst ◽  
2015 ◽  
Vol 140 (5) ◽  
pp. 1543-1550 ◽  
Author(s):  
Loanda R. Cumba ◽  
Jamie P. Smith ◽  
Dale A. C. Brownson ◽  
Jesús Iniesta ◽  
Jonathan P. Metters ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphite Electrodes ◽  
Reduced Graphene ◽  
First Time ◽  
Screen Printed

We demonstrate, for the first time, that the electroanalytical quantification of pindolol is actually possible using bare (unmodified) screen-printed graphite electrodes (SPEs).

Enhancing the Power Conversion Efficiency of Inverted Organic Photovoltaics with Gold Functionalized Reduced Graphene Oxide

2015 ◽  
Vol 1737 ◽  
Author(s):  
Rebecca Isseroff ◽  
Zhenhua Yang ◽  
Jessica Kim ◽  
Andrew Chen ◽  
Miriam Rafailovich
Keyword(s):  
Graphene Oxide ◽  
Fermi Level ◽  
Reduced Graphene Oxide ◽  
Active Layer ◽  
Energy Gap ◽  
Power Conversion ◽  
Design Phase ◽  
Reduced Graphene ◽  
Exciton Recombination ◽  
First Time

ABSTRACTIn this study, an “inverted” design, phase-separated morphology and gold-functionalized reduced graphene oxide (Au-rGO) were used to address exciton recombination and poor Fermi level alignment. To increase efficiencies, a unique methodology was used to coat Au-rGO on top of the active layer. When 0.05 Au-rGO was blended with the active layer, there were metal-thiolate bonds with P3HT and π-π stacking with PCBM. However, KPFM, measured for the first time for this material, showed that the while 0.05mM Au-rGO reduced the energy gap between P3HT and PBCM, this was offset by recombination. KPFM showed that Au-rGO may be better suited between the active layer and electrode. When 0.5mM Au-rGO was coated on top of the active layer, efficiency increased (p<0.002) nearly 600%, suggesting that Au-rGO is a more effective acceptor than a constituent of the active layer.

scholarly journals Reduced Graphene Oxide/Gold Nanoparticles Modified Screen-Printed Electrode for the Determination of Palmitic Acid

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Chin Boon Ching ◽  
Jaafar Abdullah ◽  
Nor Azah Yusof
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Palmitic Acid ◽  
Reduced Graphene Oxide ◽  
Palm Oil ◽  
Water Mixture ◽  
Reduced Graphene ◽  
Electrochemical Approach ◽  
Screen Printed

Palm oil is one of the major oils and fats produced in the world today. The quality of palm oil is crucial to be investigated, and one of the quality indices is free fatty acid (FFA) content. Therefore, in this study, an electrochemical approach for the determination of FFA has been explored as an alternative to replace the conventional method (titration method). The electrochemical method was developed based on electrochemically reduced graphene oxide (rGO) coupled with gold nanoparticles (AuNPs) deposited onto a screen-printed carbon electrode (SPCE) via drop-casting technique. The voltammetric behaviour of 2-methyl-1,4-naphthoquinone (VK3) in the presence of palmitic acid at the modified electrode was investigated in an acetonitrile/water mixture containing lithium perchlorate (LiClO4). The electrochemical detection of palmitic acid was based on the voltammetric reduction of VK3 to form the corresponding hydroquinone which is proportional to the concentration of palmitic acid. Under optimum conditions, the developed method showed a good linear relationship towards palmitic acid in the concentration ranging from 0.192 mM to 0.833 mM with the detection limit of 0.015 mM. The exploration of the developed system is expected to achieve high sensitivity and excellent selectivity towards the determination of FFA content in palm oil.

Potentiometric Taste Sensing Using Reduced Graphene Oxide Screen Printed Electrodes

2020 ◽  
Vol 18 (12) ◽  
pp. 881-888
Author(s):  
Anil B. Patil ◽  
Umesh. J. Tupe ◽  
Vikas V. Deshmane ◽  
Arun V. Patil
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Principal Component ◽  
Experimental Results ◽  
Statistical Tool ◽  
Sensing Applications ◽  
Screen Printed Electrodes ◽  
Reduced Graphene ◽  
Pharmaceutical Industries ◽  
Screen Printed

This paper reports the development of simple and economical reduced graphene oxide (rGO) based screen-printed electrodes (SPE) for five basic taste sensing applications. Twenty different test solutions for the five tastes of salty, sour, sweet, umami, and bitter at 1 ppm, 10 ppm, 100 ppm, 1000 ppm concentration levels were tested with the fabricated SPEs. From experimental results, electrical signals generated between the electrode and test solution interface were measured using the potentiometric method. Satisfactory potentiometric responses of SPEs to different ppm concentrations for each sample were used to analyze the sample data. Histogram using the statistical tool was used to analyze the changes in the conductivity response. A multivariate Principal Component Analysis (PCA) statistical tool correlated using loading plots between variables and factors of all the five basic tastes. The plot showed the interrelation between variables and test samples. The obtained experimental results from these rGO based SPEs make them suitable for their use in taste sensing applications such as for any taste disorder disability, food-producing industry, pharmaceutical industries, etc.

Graphite-specific peptide mediated synthesis of Pt nanoparticles on reduced graphene oxide for electrochemical detection of H2O2

2016 ◽  
Vol 09 (03) ◽  
pp. 1650051 ◽  
Author(s):  
Li Wang ◽  
Yantao Sun ◽  
Xiangxin Xue ◽  
Yujing Sun ◽  
Zhuang Li
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Electrochemical Detection ◽  
Electrocatalytic Activity ◽  
Pt Nanoparticles ◽  
Effective Strategy ◽  
Platinum Nanoparticle ◽  
Reduced Graphene ◽  
First Time ◽  
Specific Peptide

We demonstrate here a facile and effective strategy to prepare reduced graphene oxide-platinum nanoparticle (RGO-PtNP) nanohybrids by the mediation of graphite-specific peptide (GSP). For the first time, we found that GSP can be used to modify RGO non-covalently in one way, and in another way promote the formation of PtNPs on RGO as a biomolecular bridge. The created RGO-PtNP nanohybrids show enhanced electrocatalytic activity toward H2O2 and can be utilized to fabricate non-enzymatic electrochemical H2O2 sensor.

Controlled engineering of nano-sized FeOOH@ZnO hetero-structures on reduced graphene oxide for lithium-ion storage and photo-Fenton reaction

CrystEngComm ◽  
2020 ◽  
Vol 22 (16) ◽  
pp. 2827-2836 ◽  
Author(s):  
Binghui Xu ◽  
Xin Dai ◽  
Qingke Tan ◽  
Yuan Wei ◽  
Gonggang Liu ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Fenton Reaction ◽  
Lithium Ion ◽  
Ternary Composite ◽  
Hetero Structure ◽  
Reduced Graphene ◽  
Ion Storage ◽  
First Time

In this work, a nano-sized goethite and zinc oxide hetero-structure (FeOOH@ZnO) dispersed on reduced graphene oxide (RGO) sheets was synthesized for the first time to construct a ternary composite (FeOOH@ZnO/RGO) via a stepped graphene oxide (GO) deoxygenation process.

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