Localized surface plasmon resonance (LSPR) detection of hydrogen gas by Pd2+/Au core/shell like colloidal nanoparticles
Localized surface plasmon resonance (LSPR) detection of hydrogen gas by Pd2+/Au core/shell like colloidal nanoparticles
复制标题
DOI：
10.1016/j.ijhydene.2019.10.168
复制
发表时间：
2020-01-01
影响因子：
7.2
通讯作者：
Salamati, Hadi
中科院分区：
文献类型：
--
作者：
Farnood, Ameneh;Ranjbar, Mehdi;Salamati, Hadi
基于金纳米粒子的等离子体性质，提出了一种氢探测器胶体溶液。在去离子水中，采用脉冲激光烧蚀法制备了GNP。在得到的GNPs胶体溶液中加入不同浓度的PdCl2溶液。X射线衍射(XRD)证实了金属金的形成和PdCl2相的存在。透射电子显微镜(TEM)和X射线光电子能谱(XPS)显示Pd2+/Au纳米粒子形成了核壳状结构。氢化后的产物经透射电子显微镜观察到核壳结构转变为游离的纳米粒子，XPS分析表明形成了金属Pd相。伏安分析表明，金-PdCl2等离子体体系具有良好的吸放氢能力。加入PdCl2水溶液后，Pd2+的红移从522 nm变为526 nm，这是由于Pd2+离子被裸露的GNPs表面的负电荷吸引，形成了核壳状的形貌。在不同Au/Pd摩尔比的胶体样品中，跟踪了稀氢(0.3-10%)注入过程中PdCl2的光学吸收峰(207-236 nm)以及GNPs的LSPR峰。发现PdCl2峰由于Pd2+-&Gt；Pd-0的转化而下降，更重要的是，由于周围GNPs化学性质的改变，金峰发生了蓝移。当氢浓度变化时，PdCl2的吸收强度与金的LSPR峰位有很好的相关性。在这种关联中，对于低浓度氢的理想检测能力(
A hydrogen detector colloidal solution based on the plasmonic properties of gold nano particles (GNPs) is presented. GNPs were prepared by pulsed laser ablation (PLA) of gold target in DI water. PdCl2 solution with different concentration was added to the obtained GNPs colloidal solutions. X-ray diffraction (XRD) confirmed the formation of metallic gold and presence of PdCl2 phases. Transmission electron microscope (TEM) images along with X-ray photoelectron spectroscopy (XPS) revealed formation of the core-shell-like structures of Pd2+/Au NPs. After hydrogenation, TEM revealed that the core-shell morphology changes into free NPs and XPS revealed formation of the metallic Pd phase. Voltammetry analysis showed a well absorption and desorption capability of hydrogen in this gold-PdCl2 plasmonic system. After adding PdCl2 aqueous solution, a red-shift from 522 to 526 nm was observed which was attributed to Pd2+ ion attraction by the negative surface charge of bare GNPs and formation a core-shell like morphology. The optical absorption peaks of PdCl2 (the range 207-236 nm) as well as the LSPR peak of GNPs were traced during diluted hydrogen (0.3-10%) injection in colloidal samples with different Au:Pd molar ratio. It was found that the PdCl2 peaks drop due to Pd2+-> Pd-0 conversion and more importantly, the gold peak undergoes blue shift due to change in chemical properties of GNPs surrounding. A good correlation between PdCl2 absorption intensity and gold LSPR peak position was found when hydrogen concentration was varied. In this correlation, a desirable detection capability for low concentrations of hydrogen (