Tuning the surface enhanced Raman scattering and catalytic activities of gold nanorods by controlled coating of platinum

Sharma, Vipul; Sinha, Niraj; Dutt, Sunil; Chawla, Mohit; Siril, Prem Felix

doi:10.1016/j.jcis.2015.10.036

Cited by 30 publications

(18 citation statements)

References 51 publications

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“…All the major characteristic bands of MB at 1616, 1393, 770, 501 and 445 cm −1 are observed in the figure. The bands at 1616, 1393 and 445 cm −1 correspond to ν(C−C) stretching, symmetric and asymmetric ν(C−N) and δ(C−N‐C) skeletal bending respectively ,. Figure presents the Raman spectra of MB (10 −5 M) in the absence and presence of the different substrates that were prepared in the present work.…”

Section: Resultsmentioning

confidence: 99%

“…This blue shifting in the characteristic Raman bands of MB is attributed to the charge transfer interaction between MB and the substrates ,. The enhancement factor (EF) for the substrates was calculated by the following equation

true E F = \frac{I_{S E R S} / C_{S E R S}}{I_{R S} / C_{R S}}

…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, the safe and efficient detection and disposal of such dyes is a research area of high impact . While the disposal of dyes can be achieved by using methods like solid phase extraction, chemical reduction, photodegradation and reverse osmosis, their sensitive detection is possible using various spectroscopic and chromatographic techniques . The Au−Pd nanostructures showed exceptionally high sensitivity for the detection of dyes as a substrate for surface enhanced Raman scattering (SERS), capable to detect methylene blue (MB) down to the nano molar concentrations .…”

Section: Introductionmentioning

confidence: 97%

“…[69] The AuÀ Pd nanostructures showed exceptionally high sensitivity for the detection of dyes as a substrate for surface enhanced Raman scattering (SERS), capable to detect methylene blue (MB) down to the nano molar concentrations. [69] SERS is a fingerprint method to characterize the vibrational levels of molecules and has been widely demonstrated as a powerful tool for the trace detection of dyes. [70,71]…”

Section: Introductionmentioning

confidence: 99%

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Exceptional Catalytic Activities and Sensing Performance of Palladium Decorated Anisotropic Gold Nanoparticles

2018

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The present perspective explores the effect of composition and morphology on the catalytic and surface enhanced Raman scattering (SERS) sensing applications of anisotropic bimetallic gold‐palladium (Au−Pd) nanoparticles. The morphology of the nanoparticles was controlled by a ‘soft’ templating approach by using a hexagonal lyotropic liquid crystalline phase. The mesophases comprised of toluene‐swollen surfactant cylinders, doped with the gold (Au) and palladium (Pd) precursors, stabilized by a monolayer of surfactant and co‐surfactant molecules, arranged in a hexagonal lattice in water as continuous medium. Anisotropic nanostructures of Au having very small Pd nanoparticles deposited on their surface were produced when hexagonal mesophases containing Au and Pd precursors were subjected to gamma irradiation. The synthesized nanomaterials were thoroughly characterized using X‐ray diffraction (XRD), transmission electron microscopy (TEM) and X‐ray photoemission spectroscopy (XPS). These nanomaterials showed exceptionally high catalytic activities for the reduction of 4‐nitrophenol with the normalized rate constant of the bimetallic Au−Pd catalyst being 1.5 times higher than the best catalyst that is reported in the literature. These bimetallic Au−Pd nanostructures also demonstrated very good enhancement for Raman signals of methylene blue by demonstrating an enhancement factor of the order of 106 and a detection limit as low as 0.1 nM.

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Section: Resultsmentioning

confidence: 99%

true E F = \frac{I_{S E R S} / C_{S E R S}}{I_{R S} / C_{R S}}

…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Exceptional Catalytic Activities and Sensing Performance of Palladium Decorated Anisotropic Gold Nanoparticles

2018

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“…The enhancement factor (EF) for the plant leaf based SERS substrates was calculated by the following equation [31]: (1) where, I SERS is the intensity of enhanced spectrum, C SERS is the concentration of analyte in enhanced spectrum, I RS is the intensity of the Raman spectra of L-cysteine alone and C RS is the concentration of L-cysteine without any substrate. The EF values determined for the different substrates are shown in Figure 6.…”

Section: Acuminata)mentioning

confidence: 99%

Sensitive Detection of Biomolecules by Surface Enhanced Raman Scattering using Plant Leaves as Natural Substrates

Sharma

Krishnan

2017

EPJ Web Conf.

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Abstract. Detection of biomolecules is highly important for biomedical and other biological applications. Although several methods exist for the detection of biomolecules, surface enhanced Raman scattering (SERS) has a unique role in greatly enhancing the sensitivity. In this work, we have demonstrated the use of natural plant leaves as facile, low cost and eco-friendly SERS substrates for the sensitive detection of biomolecules. Specifically, we have investigated the influence of surface topography of five different plant leaf based substrates, deposited with Au, on the SERS performance by using L-cysteine as a model biomolecule. In addition, we have also compared the effect of sputter deposition of Au thin film with dropcast deposition of Au nanoparticles on the leaf substrates. Our results indicate that L-cysteine could be detected with high sensitivity using these plant leaf based substrates and the leaf possessing hierarchical micro/nanostructures on its surface shows higher SERS enhancement compared to a leaf having a nearplanar surface. Furthermore, leaves with drop-casted Au nanoparticle clusters performed better than the leaves sputter deposited with a thin Au film.

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Breathable, Flexible, Transparent, Hydrophobic, and Biotic Sustainable Electrodes for Heating and Biopotential Signal Measurement Applications

et al. 2022

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Flexible electronics is an interdisciplinary research area that combines a variety of research fields, such as chemistry, physics, material science, electronic and electrical engineering, mechanical engineering, computing science, and application-related fields such as biomedical engineering. [1] The outcomes are compliant devices that can maintain mechanical integrity and electrical functionality while they are lightweight and conformable over uneven surfaces. [2,3] Maintaining the mechanical and electrical integrity of the device during the deformation is the main challenge that needs to be addressed. [2] In response to the challenges, the development of novel flexible materials and special mechanical designs are key remedies in designing the substrates and active components used in flexible electronics. There are commonly used flexible materials as substrate and conductive layers: either organic [4,5] (e.g., small molecules, polymers) or inorganic [6,7] (e.g., metal nanowires, graphene, carbon nanotube). Likewise, different strategies in the structural design of stretchable systems are commonly used, such as in-plane/out-of-plane wavy structures, origami and kirigami structures as well as the islandbridge approach where rigid functional units are miniaturized and linked together by deformable interconnections. [8][9][10] Among various kinds of applications, healthcare devices, including skin patches, smart clothing, and other devices that interface with the skin or other tissues are increasing their importance in remote patient monitoring and treatment. [11] Learning from nature provides a tremendous number of lessons for scientists to develop new materials and designs. [12] Therefore, bioinspired materials with special functionalities have gained a lot of attention in engineering research. Scientists are inspired by the unique microstructures of these functional biological materials that can offer new features for various applications. [13,14] Among the number of biostructure patterns, fractal-like structures are available in nature. Examples of fractal-like structures in nature are snowflakes and leaf skeletons. Fractal-like designs which offer high surface area, improved stability, and efficient transport of ions in the materials have been

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Tuning the surface enhanced Raman scattering and catalytic activities of gold nanorods by controlled coating of platinum

Cited by 30 publications

References 51 publications

Exceptional Catalytic Activities and Sensing Performance of Palladium Decorated Anisotropic Gold Nanoparticles

Exceptional Catalytic Activities and Sensing Performance of Palladium Decorated Anisotropic Gold Nanoparticles

Sensitive Detection of Biomolecules by Surface Enhanced Raman Scattering using Plant Leaves as Natural Substrates

Breathable, Flexible, Transparent, Hydrophobic, and Biotic Sustainable Electrodes for Heating and Biopotential Signal Measurement Applications

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