Au concentration‐dependent quenching of Raman 2D peak in graphene

Ranjan, Pranay; Tulika,; Laha, Ranjit; Balakrishnan, Jayakumar

doi:10.1002/jrs.5075

Cited by 18 publications

(6 citation statements)

References 48 publications

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“…Graphene, a novel carbon nanomaterial, is a monolayer of carbon atoms in a tightly stacked honeycomb two-dimensional (2D) lattice [137][138][139]. It has superior performance such as excellent electrical conductivity, high surface area, and high stability, making them ideal materials to composite with metal oxides for glucose sensing [140][141][142][143].…”

Section: Graphene/metal Oxide Composite-based Electrodementioning

confidence: 99%

Metal oxide-based composite for non-enzymatic glucose sensors

Liu

Zeng

Guo

et al. 2020

J Mater Sci: Mater Electron

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The increasing demand for monitoring the glucose concentration in the blood of diabetic patients has aroused the attention of researchers to prepare high-performance glucose biosensors. After decades of development, enzyme-based biosensors have gradually matured and commercialized, but they still suffer from insufficient stability due to the inherent defects of the enzyme. Non-enzymatic glucose sensor was proposed to address this issue. The introduction of nanotechnology has provided more possibilities for the preparation of highly efficient catalytic materials. Among the synthesized electrocatalysts, metal oxides are one of the most important components owing to their outstanding properties. Recent studies have integrated metal oxides with other materials to further improve sensor performance. This review focuses on the application of metal oxide-based hybrid structure in the glucose sensor, mainly including metal oxide/metal oxide, metal/metal oxide, and carbon material/metal oxide. The preparation method, electrochemical properties, and catalytic mechanism of the sensors are discussed in detail. Finally, we present some of the existing challenges and make personal predictions for the future development of non-enzymatic glucose sensors.

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Section: Graphene/metal Oxide Composite-based Electrodementioning

confidence: 99%

Metal oxide-based composite for non-enzymatic glucose sensors

Liu

Zeng

Guo

et al. 2020

J Mater Sci: Mater Electron

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“…The two prominent Raman peaks of graphene, 2D, and G, show very different behavior with AuNC introduction. The Raman 2D peak intensity decreases with Au coverage and finally is quenched for moderate Au nanoparticle coverage, whereas the G peak shows an AuNC size‐dependent enhancement in peak intensity . Uhlirova et al measured Raman excitation profiles of hybrid systems constituted by single‐layer graphene and free base phthalocyanine and found two mechanisms of graphene‐enhanced Raman scattering.…”

Section: Nannomaterialsmentioning

confidence: 99%

“…The Raman 2D peak intensity decreases with Au coverage and finally is quenched for moderate Au nanoparticle coverage, whereas the G peak shows an AuNC size-dependent enhancement in peak intensity. [82] Uhlirova et al measured Raman excitation profiles of hybrid systems constituted by single-layer graphene and free base phthalocyanine and found two mechanisms of graphene-enhanced Raman scattering. The ability of single-layer graphene to enhance Raman scattering of planar aromatic molecules, denoted as graphene-enhanced Raman scattering (GERS), is currently the subject of focused interest.…”

Section: Carbon Nanotubes Carbon Materials Graphene Layered Solimentioning

confidence: 99%

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Nafie

2018

J Raman Spectroscopy

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This annual review is an overview of advances in the field of Raman spectroscopy as found in papers published in the previous calendar year in the Journal of Raman Spectroscopy (JRS), as well as in trends over the past decade across journals that have published papers important to the field of Raman spectroscopy. This information is gleaned from statistical data on article counts obtained from the Clarivate Analytic's Web of Science Core Collection by year and by subfield of Raman spectroscopy. Additional information is gleaned from presentations at the XXVI International Conference on Raman Spectroscopy (ICORS 2018) in Jeju Island, Korea in August 2018, and contributions on Raman scattering at SCIX 2018, organized by the Federation of Analytical Chemistry and Spectroscopy Societies (FACSS) in Atlanta, Georgia, USA in October 2018. Coverage is also provided for topics from the European Conference on Nonlinear Optical Spetroscopy (ECONOS 2018) held in April in Milan, Italy and GeoRaman 2018 in Catania, Italy in June. Finally, papers published in JRS in 2017 are highlighted and arranged by topics at the frontier of Raman spectroscopy. On the basis of this survey information, it is clear that Raman spectroscopy continues as in recent years as a rapidly expanding field of research across a wide range of novel disciplines and applications that provide sensitive photonic information of matter at the molecular level.

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“…To gain insights into graphene-metal interface creating localized hybridization pocket, promoting charge transfer and/or exchange/sharing of electrons between the metal nanoparticles surface adsorbed on graphene and the probe molecule as basic process for chemical SERS enhancement, suggested by an independent parametric study, we performed density functional theory calculations paired with high-quality adatom basis sets. [43,44,[60][61][62] Figure 9 shows the optimized geometries of Ag and Au, respectively, adsorbed on graphene, GO, and GO* structures at metal/C~6%. Increased Ag and Au concentrations from metal/C~3% to 6% lead to metal cluster formations for both cases, similar to Li/ graphene.…”

Section: Charge Transfer Population Using Dftmentioning

confidence: 99%

Molecular sensitivity of metal nanoparticles decorated graphene‐family nanomaterials as surface‐enhanced Raman scattering (SERS) platforms

Gupta

Banaszak²,

Smith³

et al. 2017

J Raman Spectroscopy

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Graphene‐mediated surface enhanced Raman scattering is a recent phenomenon that produces clean and reproducible signals from chemical analytes. In this work, we report on the development of graphene‐family nanomaterials (graphene oxide; GO, reduced GO; rGO, and multilayer graphene; MLG) decorated with physisorbed silver (AgNP) and gold (AuNP) nanoparticles and as layered architectures for detection of methylene blue and rhodamine 6G dyes in view of optical and biological significance. The experimental results illustrate four orders of magnitude graphene‐mediated surface enhanced Raman scattering enhancement in the order rGO/AgNP > GO/AgNP > MLG/AgNP for physisorbed and cascade amplified signal on multilayer architectures, larger than those only on graphene and metal nanoparticles, which is achieved at optimal size of Ag (30 nm) and Au (40 nm) on rGO. Moreover, highly‐sensitive graphene‐decorated nanoparticle are capable of molecular detection over a broad concentration range 10 pM–100 μM. The findings are discussed in terms of (a) strong graphene‐metal nanoparticle coupling leading to local interfacial hybridization and polarization, (b) molecular structural symmetry of analytes in relation to nanoparticle‐graphene functionalities, and (c) effective charge transfer and exchange or sharing of charges between analyte and nanoparticles decorated graphene. Optimized metal nanoparticle‐graphene geometries and electronic properties are determined from density functional theory calculations. They identify preferred metal nanoparticle adsorption sites and long‐range electrostatic interactions and determine relative resonant charge transfer population (alternatively, chemical enhancement mechanism) values derived from the Mulliken population thus gaining insights into effective enhancement factors. These findings will help to design advanced SERS platforms for ultrasensitive detection of chemicals and biological molecules useful in bio‐nanotechnology.

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Au concentration‐dependent quenching of Raman 2D peak in graphene

Cited by 18 publications

References 48 publications

Metal oxide-based composite for non-enzymatic glucose sensors

Metal oxide-based composite for non-enzymatic glucose sensors

Recent advances in linear and nonlinear Raman spectroscopy. Part XII

Molecular sensitivity of metal nanoparticles decorated graphene‐family nanomaterials as surface‐enhanced Raman scattering (SERS) platforms

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