Cellulose nanocrystals directed in-situ assembly of Au@Ag nanostructures with multifunctional activities

Hasna M. Abdul Hakkeem; Aswathy Babu; Sudip Kumar Pal; A. Peer Mohamed; Sujit Kumar Ghosh; Saju Pillai

doi:10.1016/j.microc.2021.106393

Cellulose nanocrystals directed in-situ assembly of Au@Ag nanostructures with multifunctional activities

Hasna M. Abdul Hakkeem, Aswathy Babu, Sudip Kumar Pal, A. Peer Mohamed, Sujit Kumar Ghosh, Saju Pillai

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Bio-template-directed synthesis of shell-engineered plasmonic nano-assemblies has attracted extensive research interest due to their profound opto-electronic properties. Herein, we report TEMPO-oxidized cellulose nanocrystals (TCNC) as a promising bio-template for the in-situ preparation and assembly of Au_core-Ag_shell nanoparticles (Au@Ag NPs) having excellent colloidal stability with tunable optical and catalytic properties. By modulating Ag shell thickness, TCNC promoted the assembly of Au@Ag nanostructures and resulted in abundant plasmonic hotspots. Thereby as-formed TCNC payloads could enhance its solid-state SERS activity in detecting malachite green and methylene blue concentration down to 10 fM and 100 fM, respectively. The finite element modelling (FEM) studies further supported the observed results, revealing the enhanced electric field concentrates at the junction of two adjacent TCNC-Au@Ag NPs as the origin of augmentation in the SERS signals. Further, TCNC-Au@Ag NPs assemblies showed superior catalytic activity towards 4-nitrophenol reduction with a rate constant of 32.33 × 10⁻³ s⁻¹.

Original language	English
Article number	106393
Journal	Microchemical Journal
Volume	168
DOIs	https://doi.org/10.1016/j.microc.2021.106393
Publication status	Published - Sep 2021
Externally published	Yes

Keywords

Au@Ag core–shell nanostructures
Bio-template
FEM simulation
Nano-assemblies
Plasmonic hotspots
TEMPO-oxidised cellulose nanocrystal (TCNC)

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10.1016/j.microc.2021.106393

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title = "Cellulose nanocrystals directed in-situ assembly of Au@Ag nanostructures with multifunctional activities",

abstract = "Bio-template-directed synthesis of shell-engineered plasmonic nano-assemblies has attracted extensive research interest due to their profound opto-electronic properties. Herein, we report TEMPO-oxidized cellulose nanocrystals (TCNC) as a promising bio-template for the in-situ preparation and assembly of Aucore-Agshell nanoparticles (Au@Ag NPs) having excellent colloidal stability with tunable optical and catalytic properties. By modulating Ag shell thickness, TCNC promoted the assembly of Au@Ag nanostructures and resulted in abundant plasmonic hotspots. Thereby as-formed TCNC payloads could enhance its solid-state SERS activity in detecting malachite green and methylene blue concentration down to 10 fM and 100 fM, respectively. The finite element modelling (FEM) studies further supported the observed results, revealing the enhanced electric field concentrates at the junction of two adjacent TCNC-Au@Ag NPs as the origin of augmentation in the SERS signals. Further, TCNC-Au@Ag NPs assemblies showed superior catalytic activity towards 4-nitrophenol reduction with a rate constant of 32.33 × 10−3 s−1.",

keywords = "Au@Ag core–shell nanostructures, Bio-template, FEM simulation, Nano-assemblies, Plasmonic hotspots, TEMPO-oxidised cellulose nanocrystal (TCNC)",

author = "{M. Abdul Hakkeem}, Hasna and Aswathy Babu and {Kumar Pal}, Sudip and {Peer Mohamed}, A. and {Kumar Ghosh}, Sujit and Saju Pillai",

note = "Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = sep,

doi = "10.1016/j.microc.2021.106393",

language = "English",

volume = "168",

journal = "Microchemical Journal",

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TY - JOUR

T1 - Cellulose nanocrystals directed in-situ assembly of Au@Ag nanostructures with multifunctional activities

AU - M. Abdul Hakkeem, Hasna

AU - Babu, Aswathy

AU - Kumar Pal, Sudip

AU - Peer Mohamed, A.

AU - Kumar Ghosh, Sujit

AU - Pillai, Saju

PY - 2021/9

Y1 - 2021/9

N2 - Bio-template-directed synthesis of shell-engineered plasmonic nano-assemblies has attracted extensive research interest due to their profound opto-electronic properties. Herein, we report TEMPO-oxidized cellulose nanocrystals (TCNC) as a promising bio-template for the in-situ preparation and assembly of Aucore-Agshell nanoparticles (Au@Ag NPs) having excellent colloidal stability with tunable optical and catalytic properties. By modulating Ag shell thickness, TCNC promoted the assembly of Au@Ag nanostructures and resulted in abundant plasmonic hotspots. Thereby as-formed TCNC payloads could enhance its solid-state SERS activity in detecting malachite green and methylene blue concentration down to 10 fM and 100 fM, respectively. The finite element modelling (FEM) studies further supported the observed results, revealing the enhanced electric field concentrates at the junction of two adjacent TCNC-Au@Ag NPs as the origin of augmentation in the SERS signals. Further, TCNC-Au@Ag NPs assemblies showed superior catalytic activity towards 4-nitrophenol reduction with a rate constant of 32.33 × 10−3 s−1.

AB - Bio-template-directed synthesis of shell-engineered plasmonic nano-assemblies has attracted extensive research interest due to their profound opto-electronic properties. Herein, we report TEMPO-oxidized cellulose nanocrystals (TCNC) as a promising bio-template for the in-situ preparation and assembly of Aucore-Agshell nanoparticles (Au@Ag NPs) having excellent colloidal stability with tunable optical and catalytic properties. By modulating Ag shell thickness, TCNC promoted the assembly of Au@Ag nanostructures and resulted in abundant plasmonic hotspots. Thereby as-formed TCNC payloads could enhance its solid-state SERS activity in detecting malachite green and methylene blue concentration down to 10 fM and 100 fM, respectively. The finite element modelling (FEM) studies further supported the observed results, revealing the enhanced electric field concentrates at the junction of two adjacent TCNC-Au@Ag NPs as the origin of augmentation in the SERS signals. Further, TCNC-Au@Ag NPs assemblies showed superior catalytic activity towards 4-nitrophenol reduction with a rate constant of 32.33 × 10−3 s−1.

KW - Au@Ag core–shell nanostructures

KW - Bio-template

KW - FEM simulation

KW - Nano-assemblies

KW - Plasmonic hotspots

KW - TEMPO-oxidised cellulose nanocrystal (TCNC)

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DO - 10.1016/j.microc.2021.106393

M3 - Article

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SN - 0026-265X

VL - 168

JO - Microchemical Journal

JF - Microchemical Journal

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ER -

Cellulose nanocrystals directed in-situ assembly of Au@Ag nanostructures with multifunctional activities

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Keywords

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