Department of Food Sciences & Nutrition, College of Food and Agricultural Sciences, King Saud University, Riyadh 11451, Saudi Arabia.
Nanobiotechnology Laboratory, Department of Biotechnology, Bannari Amman Institute of Technology, Sathyamangalam, Tamil Nadu, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2022 Apr 5;270:120793. doi: 10.1016/j.saa.2021.120793. Epub 2021 Dec 22.
Novel Ag@Ni nanosphere decorated with CdS NPs (Ag@Ni-CdS NCs) was synthesized by one step chemical synthesis method. The fabricated NCs were characterized by transmission electron microscope (TEM), scanning electron microscope (SEM), fourier transfer infra-red spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), zeta sizer and particle size analyzer. TEM and XRD confirmed the Ag in core and Ni in shell for the effective formation of Ag@Ni core shell nanosphere. EDAX and XPS spectra of NCs confirms the formation of Ag@Ni-CdS NCs. Zeta potential and particle size of the NCs was found to be 29.5 ± 1.5 mV and 24 ± 1 nm respectively. The complete loss in the peak intensity of Ag@Ni-CdS NCs (localized surface plasmon resonance (LSPR)) at ∼410 nm in presence of S ions was observed which indicates its selective detection towards S ions. The sulfide ion sensing by Ag@Ni-CdS NCs was due to the successive oxidation of Ag results in the formulation of Ag ions in the system, which causes the diminishing of LSPR band of NCs. The limit of detection (LOD) of S ions by Ag@Ni-CdS NCs was calculated to be of 2.66 nM. The combination of CdS NPs with core-shell Ag@Ni nanosphere guides a promising strategy for S ions detection from environmental polluted samples.
通过一步化学合成方法合成了新型 Ag@Ni 纳米球负载的 CdS NPs（Ag@Ni-CdS NCs）。所制备的 NCs 采用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）、X 射线光电子能谱（XPS）、Zeta 电位仪和粒径分析仪进行了表征。TEM 和 XRD 证实了 Ag 位于核，Ni 位于壳，从而有效地形成了 Ag@Ni 核壳纳米球。NCs 的 EDAX 和 XPS 谱证实了 Ag@Ni-CdS NCs 的形成。NCs 的 Zeta 电位和粒径分别为 29.5±1.5 mV 和 24±1nm。在 S 离子存在下，Ag@Ni-CdS NCs 的峰值强度（局域表面等离子体共振（LSPR））完全消失在∼410nm 处，这表明其对 S 离子具有选择性检测。Ag@Ni-CdS NCs 对硫化物离子的检测是由于 Ag 的连续氧化导致体系中形成了 Ag 离子，从而导致 NCs 的 LSPR 带减弱。Ag@Ni-CdS NCs 对 S 离子的检测限（LOD）计算为 2.66 nM。CdS NPs 与核壳 Ag@Ni 纳米球的结合为从环境污染物样品中检测 S 离子提供了一种很有前途的策略。
