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Facile synthesis of CTAB coated Au-Ag core-shell nanoparticles and their catalytic and antibacterial activity

Facile synthesis of CTAB coated Au-Ag core-shell nanoparticles and their catalytic and antibacterial activity
Facile synthesis of CTAB coated Au-Ag core-shell nanoparticles and their catalytic and antibacterial activity

This work reports the synthesis of cationic surfactant-coated Au-Ag core-shell (Au@Ag) nanoparticles (NPs) via a straightforward seed-mediated approach. The UV-Vis analysis showed that the plasmon peak position of synthesized Au@Ag NPs correlated with the thickness of the Ag shell encapsulating the Au core. The Au@Ag NPs have shown impressive catalytic performance for the reduction reactions of 4-nitrophenol (4-NP) and methyl orange (MO) where the apparent rate constant experienced a remarkable increase by 67-fold and 90-fold, respectively, when Au@Ag NPs with the Ag-shell thickness of 6.3 nm were employed as a catalyst, compared to Au NPs. This multifold improvement in the activity cannot be simply accounted for by the increase in surface area of NPs and is attributed to the electronic synergistic effects between Au and Ag in the core-shell NPs. Furthermore, while Au@Ag NPs exhibited heightened antibacterial activity against both Gram-positive S. aureus and Gram-negative E. coli bacteria, this enhancement is modest. Notably, the anticipated significant enhancement attributed to Ag's renowned antibacterial properties was not observed. The presence of cationic surfactant cetyltrimethylammonium bromide (CTAB) enables both Au and Au@Ag NPs to effectively bind with the negatively charged bacterial cell membranes through electrostatic interactions. Apparently, CTAB enables both types of NPs to effectively target and eliminate bacteria with comparable efficiency.

4-nitrophenol, Antibacterial, Catalysis, Core-shell nanoparticles, Methyl orange, Noble-metal nanoparticles
1040-7278
Ashraf, Shaffaq
a1f25839-0c83-499e-a9b4-112e7a35f3ac
Batool, Unsia
9b98a934-daf6-4e50-afd5-a4a2452047ca
Khan, Ghazanfar Ali
f448e40c-4e64-4462-ad69-325cfde0a0d5
Azad, Mamoona
840ab56b-eb99-403c-bde7-7f15c7a4268c
Shahbaz, Rabia
6e504978-5d31-4e82-a7df-c3f86ca2f888
Imran, Muhammad
e7d12f07-b540-4943-8d25-eb5637d828ef
Ghanem, Mohamed A.
f9b5b27c-7ebd-4e43-ac75-93d6e023fc33
Mohammed, Khaled M.H.
1c3c5641-4d0a-4c4d-bb26-fe733b8dbf63
Ahmed, Waqqar
6acb0f97-173c-4ff5-a394-49c2a107836e
Ashraf, Shaffaq
a1f25839-0c83-499e-a9b4-112e7a35f3ac
Batool, Unsia
9b98a934-daf6-4e50-afd5-a4a2452047ca
Khan, Ghazanfar Ali
f448e40c-4e64-4462-ad69-325cfde0a0d5
Azad, Mamoona
840ab56b-eb99-403c-bde7-7f15c7a4268c
Shahbaz, Rabia
6e504978-5d31-4e82-a7df-c3f86ca2f888
Imran, Muhammad
e7d12f07-b540-4943-8d25-eb5637d828ef
Ghanem, Mohamed A.
f9b5b27c-7ebd-4e43-ac75-93d6e023fc33
Mohammed, Khaled M.H.
1c3c5641-4d0a-4c4d-bb26-fe733b8dbf63
Ahmed, Waqqar
6acb0f97-173c-4ff5-a394-49c2a107836e

Ashraf, Shaffaq, Batool, Unsia, Khan, Ghazanfar Ali, Azad, Mamoona, Shahbaz, Rabia, Imran, Muhammad, Ghanem, Mohamed A., Mohammed, Khaled M.H. and Ahmed, Waqqar (2024) Facile synthesis of CTAB coated Au-Ag core-shell nanoparticles and their catalytic and antibacterial activity. Journal of Cluster Science. (doi:10.1007/s10876-024-02633-w).

Record type: Article

Abstract

This work reports the synthesis of cationic surfactant-coated Au-Ag core-shell (Au@Ag) nanoparticles (NPs) via a straightforward seed-mediated approach. The UV-Vis analysis showed that the plasmon peak position of synthesized Au@Ag NPs correlated with the thickness of the Ag shell encapsulating the Au core. The Au@Ag NPs have shown impressive catalytic performance for the reduction reactions of 4-nitrophenol (4-NP) and methyl orange (MO) where the apparent rate constant experienced a remarkable increase by 67-fold and 90-fold, respectively, when Au@Ag NPs with the Ag-shell thickness of 6.3 nm were employed as a catalyst, compared to Au NPs. This multifold improvement in the activity cannot be simply accounted for by the increase in surface area of NPs and is attributed to the electronic synergistic effects between Au and Ag in the core-shell NPs. Furthermore, while Au@Ag NPs exhibited heightened antibacterial activity against both Gram-positive S. aureus and Gram-negative E. coli bacteria, this enhancement is modest. Notably, the anticipated significant enhancement attributed to Ag's renowned antibacterial properties was not observed. The presence of cationic surfactant cetyltrimethylammonium bromide (CTAB) enables both Au and Au@Ag NPs to effectively bind with the negatively charged bacterial cell membranes through electrostatic interactions. Apparently, CTAB enables both types of NPs to effectively target and eliminate bacteria with comparable efficiency.

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Revised Manuscript_Vietnam_Journal - Accepted Manuscript
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e-pub ahead of print date: 21 May 2024
Published date: 21 May 2024
Keywords: 4-nitrophenol, Antibacterial, Catalysis, Core-shell nanoparticles, Methyl orange, Noble-metal nanoparticles

Identifiers

Local EPrints ID: 491597
URI: http://eprints.soton.ac.uk/id/eprint/491597
ISSN: 1040-7278
PURE UUID: 899a8a57-9bec-4fb7-a9de-05cf0550235a
ORCID for Khaled M.H. Mohammed: ORCID iD orcid.org/0000-0002-9538-0936

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Date deposited: 27 Jun 2024 16:47
Last modified: 12 Jul 2024 02:05

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Contributors

Author: Shaffaq Ashraf
Author: Unsia Batool
Author: Ghazanfar Ali Khan
Author: Mamoona Azad
Author: Rabia Shahbaz
Author: Muhammad Imran
Author: Mohamed A. Ghanem
Author: Waqqar Ahmed

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