Non-covalent functionalization of CVD-grown graphene with Au nanoparticles for electrochemical sensing application

Shown, Indrajit; Ganguly, Abhijit

doi:10.1007/s40097-016-0201-6

Cited by 14 publications

(7 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Afterward, the application of the enzyme-linked immunosorbent assay (ELISA) based on hydroxyproline allowed for the verification of collagen proteins in the range of µg/mL [21,22]. Currently, electrochemical sensing platforms [23,24] that incorporate specific antibodies responsible for selective antigen detection are at the centre of research interest. These kinds of sensors are highly effective tools to recognise the target analyte, with significant sensitivity and selectivity [1,2,25,26].…”

Section: Introductionmentioning

confidence: 99%

Impedimetric and Plasmonic Sensing of Collagen I Using a Half-Antibody-Supported, Au-Modified, Self-Assembled Monolayer System

et al. 2021

View full text Add to dashboard Cite

This research presents an electrochemical immunosensor for collagen I detection using a self-assembled monolayer (SAM) of gold nanoparticles (AuNPs) and covalently immobilized half-reduced monoclonal antibody as a receptor; this allowed for the validation of the collagen I concentration through two different independent methods: electrochemically by Electrochemical Impedance Spectroscopy (EIS), and optically by Surface Plasmon Resonance (SPR). The high unique advantage of the proposed sensor is based on the performance of the stable covalent immobilization of the AuNPs and enzymatically reduced half-IgG collagen I antibodies, which ensured their appropriate orientation onto the sensor’s surface, good stability, and sensitivity properties. The detection of collagen type I was performed in a concentration range from 1 to 5 pg/mL. Moreover, SPR was utilized to confirm the immobilization of the monoclonal half-antibodies and sensing of collagen I versus time. Furthermore, EIS experiments revealed a limit of detection (LOD) of 0.38 pg/mL. The selectivity of the performed immunosensor was confirmed by negligible responses for BSA. The performed approach of the immunosensor is a novel, innovative attempt that enables the detection of collagen I with very high sensitivity in the range of pg/mL, which is significantly lower than the commonly used enzyme-linked immunosorbent assay (ELISA).

show abstract

Section: Introductionmentioning

confidence: 99%

Impedimetric and Plasmonic Sensing of Collagen I Using a Half-Antibody-Supported, Au-Modified, Self-Assembled Monolayer System

et al. 2021

View full text Add to dashboard Cite

show abstract

“…For evaluating the electrochemical sensing performance of a sample , it is customary to monitor the electrochemical reduction signal of it. 70 The RGO-Au/ITO electrode is probing H 2 O 2 by way of detecting subsequent reduction by products. Thus, the working electrode is indirectly detecting the presence of H 2 O 2.…”

Section: Resultsmentioning

confidence: 99%

“…The mechanism by which the working electrode is detecting H 2 O 2 is described in Figure S9 and can be expressed by the following equation. 70 H O e OH OH The mechanism of detection of AA is briefly described in Figure S9. The RGO-Au/ITO working electrode adsorbs AA molecule from the electrolytic mixture.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Reduced Graphene Oxide Wrapped Circular Au Nanoplatelets: Enhanced Photoluminescence, Excellent Surface-Enhanced Raman Scattering, Photocatalytic Water Splitting, and Non-Enzymatic Biosensor

Majumder

Satpati

Kumar

et al. 2018

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

Herein, we demonstrate the synthesis and multifunctional properties of reduced graphene oxide (RGO)-wrapped Au nanoplatelets. We have characterized the sample by field emission scanning electron microscope (FESEM), high-resolution transmission electron microscope (HRTEM), energy-dispersive X-ray spectroscopy (EDS), high-angle annular dark-field scanning transmission electron microscopy (STEM-HAADF), electron energy-loss spectroscopy (EELS), and X-ray photoelectron spectroscopy (XPS) studies. It has been shown that the RGO wraps a large number of 2D circular Au nanoplatelets (diameter ∼15 nm). We have examined the optical property of the sample using Raman, UV–vis, and PL spectroscopic techniques. Large enhancement in intensity of Raman spectra was observed due to the surface enhanced Raman scattering (SERS) resulting from the Au nanoplatelets. The collective sway of surface plasmon resonance and fluorescence resonance energy transfer effect owing to Au gives rise to giant enhancement in intensity of photoluminescence emission spectrum. Upon visible-light irradiation, photocurrent flows through the sample due to interband 6sp transition within the Au nanoplatelets and it exhibits photocatalytic water splitting effect. The sample displays excellent nonenzymatic hydrogen peroxides (H2O2) and ascorbic acid (AA) sensing property. The value of sensitivity for H2O2 is 280.28 μA mM–1 cm–2 in the linear range of 1 μM to 0.8 mM and that for AA is 314.07 μA mM–1 cm–2 in the linear range of 25–300 μM. The lowest detection limit of both H2O2 and AA is 6.8 μM at S/N= 3. So, the sample can be used for multifunctional applications in SERS as substrate, photocatalytic water splitting, photodetectors, and nonenzymatic biosensing.

show abstract

“…Non-covalent functionalization of carbon allotropes Non-covalent functionalization of carbon allotropes is carried out principally using hydrophobic interactions, electrostatic interactions, van der Waals intermolecular force of attractions and π-π stacking. [35,36,54] Obviously, noncovalent functionalization offers an interesting protocol to functionalize the carbon allotropes as in this type of functionalization, carbon allotropes retain their most of the properties including electrical and thermal. Non-covalent functionalization of carbon allotropes, especially graphene analogues and CNTs (SWCNTs and MWCNTs) using ππ stacking is widely reported.…”

Section: Covalent Functionalization Of Carbon Allotropesmentioning

confidence: 99%

Recent advancements in corrosion inhibitor systems through carbon allotropes: Past, present, and future

et al. 2021

View full text Add to dashboard Cite

Nano-sized carbon allotropes, particularly graphene (G), graphene oxide (GO), single and multi-walled carbon nanotubes (CNTs, SWCNTs, and MWCNTs) and their chemically modified derivatives are widely used in anticorrosive coating formulations. Generally, carbon allotropes acquire nanofiller property and high hydrophobicity which make them ideal anticorrosive materials. Along with various advantages, using carbon allotropes as anticorrosive materials are connected with some specific challenges including un-controlled dispersion in polymer matrixes. Chemical functionalization using covalent and non-covalent methods are widely used to enhance their dispersibility. Magnetic stirring, ultrasonic mixing, ball milling and shear emulsification are also widely used to enhance their dispersibility. Present review article describes the covalent and non-covalent functionalization of G, GO, and CNTs and their application as corrosion inhibitors in various coating formulations and aqueous phase. Chemically modified GO shows remarkable solubility/dispersibility in the aqueous electrolytes. Advantages and challenges using these materials as corrosion inhibitors have also been discussed hereincorrosion inhibitors, nanocomposites, nanotechnology, polymer matrixes and green corrosion inhibitors 1This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

show abstract

Non-covalent functionalization of CVD-grown graphene with Au nanoparticles for electrochemical sensing application

Cited by 14 publications

References 45 publications

Impedimetric and Plasmonic Sensing of Collagen I Using a Half-Antibody-Supported, Au-Modified, Self-Assembled Monolayer System

Impedimetric and Plasmonic Sensing of Collagen I Using a Half-Antibody-Supported, Au-Modified, Self-Assembled Monolayer System

Multifunctional Reduced Graphene Oxide Wrapped Circular Au Nanoplatelets: Enhanced Photoluminescence, Excellent Surface-Enhanced Raman Scattering, Photocatalytic Water Splitting, and Non-Enzymatic Biosensor

Recent advancements in corrosion inhibitor systems through carbon allotropes: Past, present, and future

Contact Info

Product

Resources

About