Optical and antibacterial evaluation of biofunctionalized Cu:ZnS nanoparticles
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ORIGINAL ARTICLE
Optical and antibacterial evaluation of biofunctionalized Cu:ZnS nanoparticles G. Arun Kumar 1 & H. S. Bhojya Naik 1 & R. Viswanath 1 & G. Krishnamurthy 2 & Prabhaker Walmik 2 Received: 18 September 2020 / Accepted: 16 November 2020 # Qatar University and Springer Nature Switzerland AG 2020
Abstract This article focuses on the surface stabilization of ZnS NPs doped with Cu2+ ions by casein with relatively different concentrations through microwave method. The surface attributes of the fabricated NPs were characterized by FTIR, XRD, TEM, HRTEM, and EDS measurement which showed the incorporation of Cu ions in doped ZnS NPs. Optical properties were studied using UV–vis and PL spectroscopy. XRD pattern showed zinc blend structure for both uncapped and capped. Absorption spectrum was an evidence for the strong confinement effect in the form of blue shift. Spherical shape with 8 nm (uncapped) and 3 nm (capped) were specified from TEM images. PL spectrum covered UV and visible regions with shift in the emission peak towards a shorter wavelength side. Biological activity of capped NPs was highly effective against various bacterial strains with enhanced luminescence property, which makes them to materialize as an innovative division of antibacterial agent. Keywords ZnS nanoparticles . Cu doping . Casein . Photoluminescence . Antibacterial activity
1 Introduction In the recent decades, the investigation of nanosized materials in the biological field is in advance due to their exceptional physic-chemical and optical properties [1, 2]. As the microbial agents are proving to be more resistant against the conventional drugs, it has become a challenging task for the development of a new class of drugs with efficient ability. A series of metal nanoparticles especially penny metals (Ag, Au, and Cu) have been reported as an efficient antimicrobial agent and also have been employed in health industries [3, 4]. Besides these materials, some other transition metals have emerged as alternative antimicrobial agents in different forms [5–7]. In contrast to II–IV semiconductor materials, zinc both in their O and S forms are safer in terms of toxicity, i.e., its nontoxic and
* H. S. Bhojya Naik [email protected] 1
Department of Studies and Research in Industrial Chemistry, School of Chemical Sciences, Kuvempu University, Shivamogga, Shankaraghatta 577 451, India
2
Department of P.G. Studies and Research in Chemistry, Sahyadri Science College (A Constituent College of Kuvempu University), Shivamogga, Karnataka 577 203, India
biocompatible, which makes them potential agent in the biological field [8]. Doped form of ZnO nanoparticles with transition and inner transition metals have been investigated in the biological field which proved to be an efficient antimicrobial agent [9]. A countable reports have been presented with respect to ZnS doped with d and f block elements towards the biological field [10, 11]. New inclination has been located as surface modification of nanoparticles which emerges as a new gene ra
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