Facile synthesis of asymmetric patchy Janus Ag/Cu particles and study of their antifungal activity

doi:10.1007/s11706-020-0496-6

Front. Mater. Sci.

2020, Vol. 14

Issue (1) : 24-32 https://doi.org/10.1007/s11706-020-0496-6

RESEARCH ARTICLE

Facile synthesis of asymmetric patchy Janus Ag/Cu particles and study of their antifungal activity

Sudipta BISWAS¹, Satadru PRAMANIK², Suman MANDAL³, Sudeshna SARKAR¹, Sujata CHAUDHURI², Swati DE¹(

)

¹. Department of Chemistry, University of Kalyani, Kalyani-741235, Nadia, WB, India
². Department of Botany, University of Kalyani, Kalyani-741235, Nadia, WB, India
³. Department of Chemistry, Basirhat College, North 24 Parganas-743412, WB, India

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Abstract

Asymmetric patchy Ag/Cu Janus nanoparticles (NPs) were synthesized via a “seed-mediated” approach. This is the first report of synthesis of nanometer sized metal-based Janus NPs without using complicated methods. Selective adsorption of the surfactant onto the seed NPs leads to the formation of Janus type structure. Subsequently the reduction potential of Ag⁺/Ag⁰ and Cu²⁺/Cu⁰ systems directs the formation of the “patch”. The patchy Janus NPs show significant antifungal activity towards a potent rice pathogen thus offering the prospect of future application in crop protection.

Keywords patchy Janus nanoparticle seed mediated method CTAB antifungal activity

Corresponding Author(s): Swati DE

Online First Date: 26 February 2020 Issue Date: 05 March 2020

Cite this article:

Sudipta BISWAS,Satadru PRAMANIK,Suman MANDAL, et al. Facile synthesis of asymmetric patchy Janus Ag/Cu particles and study of their antifungal activity[J]. Front. Mater. Sci., 2020, 14(1): 24-32.

URL:

https://academic.hep.com.cn/foms/EN/10.1007/s11706-020-0496-6
https://academic.hep.com.cn/foms/EN/Y2020/V14/I1/24

Fig.1 Scheme 1 Schematic representation of anisotropic particles: (a) Janus particles; (b) multi-compartment particles; (c) patchy particles; (d) patchy Janus particles.

Fig.2 Scheme 2 Ag-seed mediated synthesis of Ag/Cu NPs.

Fig.3 Absorption spectra of Ag NPs (a), Cu NPs (b) and composite Ag/Cu NPs (c).

Fig.4 DLS results of (a) Ag NPs, (b) Cu NPs and (c) Ag/Cu NPs.

Fig.5 (a) TEM image and (b) HRTEM image of asymmetric patchy Janus Ag/Cu particles. (c) HRTEM image indicating the bi-phasic nature of the prepared particle. (d) HRTEM image of Ag patch and (e) corresponding SAED pattern.

Fig.6 TEM images of (a) Ag NPs and (b) Cu NPs prepared in CTAB medium.

Fig.7 XRD patterns of (a) asymmetric patchy Janus Ag/Cu particles, (b) Ag NPs only, and (c) Cu NPs only.

Fig.8 Scheme 3 The stepwise formation of asymmetric patchy Janus NPs.

Fig.9 Antifungal activity of NPs (the numbers 100 and 300 stand for volume in μL of NPs containing stock solution added to a total 5 mL volume of culture): (a) dry weight of R. solani after treatment with NPs; (b) inhibition rate in growth of R. solani after treatment with NPs.

Fig.10 Plate assays of the growth of R. solani: (a) control, without NP treatment; (b) R. solani treated with Ag NPs; (c) R. solani treated with Cu/Ag Janus NPs.

Fig.11 SEM images: (a) control, R. solani; (b) Ag/Cu treated, R. solani; (c) Ag treated, R. solani; (d) Cu treated, R. solani.

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