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4 article(s) from Kumar, Akash

Facile synthesis of size-tunable L-carnosine-capped silver nanoparticles and their role in metal ion sensing and catalytic degradation of p-nitrophenol

Akash Kumar,
Ridhima Chadha,
Abhishek Das,
Nandita Maiti and
Rayavarapu Raja Gopal

Beilstein J. Nanotechnol. 2024, 15, 1576–1592, doi:10.3762/bjnano.15.124

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Figure 1: Schematic representation of the synthesis of tunable ʟ-carnosine-capped silver nanoparticles (ʟ-car...

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Figure 2: Optical absorbance of (a) ʟ-carnosine-capped AgNP1 and (b) ʟ-carnosine-capped AgNP2–AgNP5. The inse...

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Figure 3: (a) Hydrodynamic size and zeta potential of ʟ-carnosine-capped silver nanoparticles and TEM microgr...

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Figure 4: (a) FTIR spectra of ʟ-carnosine and ʟ-car-AgNPs. Raman spectra of (b) ʟ-carnosine (solid and aqueou...

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Figure 5: Heavy metal ion sensing using ʟ-car-AgNP1. (a) UV–vis spectrophotometric determination of Cd²⁺, Pb²⁺...

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Figure 6: Heavy metal ion sensing using ʟ-car-AgNP2 and ʟ-car-AgNP5. (a) UV–vis spectrophotometric determinat...

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Figure 7: Interference study regarding the metal ion selectivity of ʟ-car-AgNP1. (a) Optical absorbance of di...

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Figure 8: Interference study regarding the metal ion selectivity of ʟ-car-AgNP2. (a) Optical absorbance of di...

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Figure 9: (a–e) UV–vis absorption measurements showing the catalytic degradation of 0.25 mM P-NP using ʟ-carn...

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Full Research Paper

Published 06 Dec 2024

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Nanoarchitectonics with cetrimonium bromide on metal nanoparticles for linker-free detection of toxic metal ions and catalytic degradation of 4-nitrophenol

Akash Kumar and
Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2024, 15, 1312–1332, doi:10.3762/bjnano.15.106

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Figure 1: (a) Wet chemical synthesis of CTAB-capped isotropic gold and silver as well as anisotropic gold nan...

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Figure 2: (a) Optical absorbance of CTAB-AgNS, CTAB-AuNS, CTAB-AuNR1, and CTAB-AuNR2 with maximum absorption ...

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Figure 3: TEM images and mean size distribution of (a, e) CTAB-AgNS, (b, f) CTAB-AuNS. TEM images and aspect ...

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Figure 4: Impact of NaOH and NaCl on as-prepared/centrifuged CTAB-capped nanoparticles. (a, b) NaOH impact on...

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Figure 5: Spectrophotometric and colorimetric detection of heavy metals using centrifuged/as-prepared isotrop...

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Figure 6: Spectrophotometric and colorimetric detection of heavy metals using centrifuged CTAB-AuNR1 and AuNR...

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Figure 7: Spectrophotometric and colorimetric detection of heavy metals using as-prepared CTAB-AuNR2 in the p...

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Figure 8: Degradation of 4 nitrophenol (4-NP) to 4 aminophenol (4-AP) using CTAB-AgNS and AuNS. (a) As-prepar...

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Figure 9: Degradation of 4 nitrophenol (4-NP) to 4 aminophenol (4-AP) using CTAB-AuNR1 and AuNR2. (a) As-prep...

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Published 04 Nov 2024

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Gold nanomakura: nanoarchitectonics and their photothermal response in association with carrageenan hydrogels

Nabojit Das,
Vikas,
Akash Kumar,
Sanjeev Soni and
Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2024, 15, 678–693, doi:10.3762/bjnano.15.56

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Figure 1: (a) Seed-mediated synthesis of CTAB-AuNM, MTAB-AuNM, and DTAB-AuNM, a two-step reduction method sho...

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Figure 2: Stability of AuNMs (CTAB-AuNM, MTAB-AuNM, and DTAB AuNM) in different media at the ratio (NPs:media...

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Figure 3: (a) k-CG hydrogel beads (HB) without AuNMs and with incorporated AuNMs; (b), (c), and (d) show stab...

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Figure 4: TEM micrographs along with histograms showing morphology and size (length) of (a) CTAB-AuNM, (b) MT...

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Figure 5: (a) FTIR spectra of CTAB-AuNM, MTAB-AuNM, and DTAB-AuNM, respectively. (b) XRD diffractogram showin...

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Figure 6: Growth mechanism of gold nanomakura particles (AuNM). (a) AuNM surrounded by surfactant micelles; (...

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Figure 7: (a) Seed-mediated synthesis of CTAB-capped AuNR. (b) Seedless synthesis of DTAB-capped AuNR. (c) Ab...

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Figure 8: Anisotropic gold nanoparticles showing photothermal response of: (a) CTAB-AuNM, MTAB-AuNM, and DTAB...

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Figure 9: (a) Temporal variation in the corresponding temperatures on photothermal interaction with a visible...

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Figure 10: Thermal images showing photothermal response in (a) DTAB-AuNR and (b) CTAB-AuNR after incorporation...

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Figure 11: Thermal images showing photothermal response in (a) CTAB-AuNM, (b) MTAB-AuNM, and (c) DTAB-AuNM aft...

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Published 07 Jun 2024

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The role of deep eutectic solvents and carrageenan in synthesizing biocompatible anisotropic metal nanoparticles

Nabojit Das,
Akash Kumar and
Raja Gopal Rayavarapu

Beilstein J. Nanotechnol. 2021, 12, 924–938, doi:10.3762/bjnano.12.69

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Figure 1: Number of publications over the last five years on the synthesis of nanoparticles (NPs)/nanomateria...

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Figure 2: Cytotoxicity of anisotropic gold metal nanoparticles in vitro and in vivo.

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Figure 3: Synthesis of gold nanoparticles of different shapes using the seed-mediated approach. Chitosan was ...

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Figure 4: A deep eutectic solvent as green solvent in the synthesis of anisotropic nanoparticles (flower shap...

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Figure 5: Carrageenan as capping and reducing agent for gold nanoparticle synthesis. (A) Histogram for the si...

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Figure 6: (A) A κ-carrageenan-stabilized hydroxyapatite rod-shaped nanocomposite. (B) Antibacterial study usi...

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Review

Published 18 Aug 2021

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