Formation of uniformly sized gold nanoparticles over graphene by MeV electron beam irradiation for transparent conducting films

Kim, Yooseok; Song, Wooseok; Lee, Su-il; Lee, Seung Youb; Cha, Myoung-Jun; Jung, Dae Soo; Park, Chong-Yun

doi:10.1063/1.4809599

Cited by 12 publications

(5 citation statements)

References 23 publications

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“…127,128 The typical process involves mixing metal salts with as-synthesized 2D materials and then subjecting them to illumination by various light sources such as ultraviolet (UV) light, 127,128 lasers, 121,[129][130][131] white light, 132 and others. 133,134 Among these light sources, UV light is the most popular. Fig.…”

Section: Preparation Of Hybrid Nanostructures Of Metal Nps/2d Materialsmentioning

confidence: 99%

Hybrid nanostructures of metal/two-dimensional nanomaterials for plasmon-enhanced applications

2016

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Hybrid nanostructures composed of graphene or other two-dimensional (2D) nanomaterials and plasmonic metal components have been extensively studied. The unusual properties of 2D materials are associated with their atomically thin thickness and 2D morphology, and many impressive structures enable the metal nanomaterials to establish various interesting hybrid nanostructures with outstanding plasmonic properties. In addition, the hybrid nanostructures display unique optical characteristics that are derived from the close conjunction of plasmonic optical effects and the unique physicochemical properties of 2D materials. More importantly, the hybrid nanostructures show several plasmonic electrical effects including an improved photogeneration rate, efficient carrier transfer, and a plasmon-induced "hot carrier", playing a significant role in enhancing device performance. They have been widely studied for plasmon-enhanced optical signals, photocatalysis, photodetectors (PDs), and solar cells. In this review, the developments in the field of metal/2D hybrid nanostructures are comprehensively described. Preparation of hybrid nanostructures is first presented according to the 2D material type, as well as the metal nanomaterial morphology. The plasmonic properties and the enabled applications of the hybrid nanostructures are then described. Lastly, possible future research in this promising field is discussed.

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Section: Preparation Of Hybrid Nanostructures Of Metal Nps/2d Materialsmentioning

confidence: 99%

Hybrid nanostructures of metal/two-dimensional nanomaterials for plasmon-enhanced applications

2016

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“…Gold salts are prone to reduction during XPS and XAS measurements, 42,43 and by direct exposure to electron beams. 44 To control for this, we impregnated a STEM grid with freshly milled powder before capturing STEM-HAADF images and EELS spectral images for Au, Cl, and Na three times, with no intermittent aging. This exposed the grid to the same electron beam dosage as samples aged for 48 h. Images and elemental maps (Fig.…”

Section: Resultsmentioning

confidence: 99%

Direct observation by high resolution transmission electron microscopy of gold(iii) particle transformation during aging reduction reaction

et al. 2023

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“…A similar approach of combining Ag and Au films of optimized NP sizes but using reduced GO has demonstrated the capability of identifying tumor cells without using biomarkers ( Figure 5 f) [ 81 ]. Such metal NPs/graphene hybrid systems have applications as SERS platforms [ 82 ] and also as transparent electrodes with improved conductivity [ 17 , 83 , 84 , 85 ].…”

Section: Hybrid Graphene-metallic Nps Systems-the Role Of Graphenementioning

confidence: 99%

Raman and Fluorescence Enhancement Approaches in Graphene-Based Platforms for Optical Sensing and Imaging

2021

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The search for novel platforms and metamaterials for the enhancement of optical and particularly Raman signals is still an objective since optical techniques offer affordable, noninvasive methods with high spatial resolution and penetration depth adequate to detect and image a large variety of systems, from 2D materials to molecules in complex media and tissues. Definitely, plasmonic materials produce the most efficient enhancement through the surface-enhanced Raman scattering (SERS) process, allowing single-molecule detection, and are the most studied ones. Here we focus on less explored aspects of SERS such as the role of the inter-nanoparticle (NP) distance and the ultra-small NP size limit (down to a few nm) and on novel approaches involving graphene and graphene-related materials. The issues on reproducibility and homogeneity for the quantification of the probe molecules will also be discussed. Other light enhancement mechanisms, in particular resonant and interference Raman scatterings, as well as the platforms that allow combining several of them, are presented in this review with a special focus on the possibilities that graphene offers for the design and fabrication of novel architectures. Recent fluorescence enhancement platforms and strategies, so important for bio-detection and imaging, are reviewed as well as the relevance of graphene oxide and graphene/carbon nanodots in the field.

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Formation of uniformly sized gold nanoparticles over graphene by MeV electron beam irradiation for transparent conducting films

Cited by 12 publications

References 23 publications

Hybrid nanostructures of metal/two-dimensional nanomaterials for plasmon-enhanced applications

Hybrid nanostructures of metal/two-dimensional nanomaterials for plasmon-enhanced applications

Direct observation by high resolution transmission electron microscopy of gold(iii) particle transformation during aging reduction reaction

Raman and Fluorescence Enhancement Approaches in Graphene-Based Platforms for Optical Sensing and Imaging

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