Interaction of L-Cysteine with ZnO: Structure, Surface Chemistry, and Optical Properties.
Interaction of L-Cysteine with ZnO: Structure, Surface Chemistry, and Optical Properties.
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DOI：
10.1021/la504968m
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发表时间：
2015-05
期刊：
影响因子：
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通讯作者：
A. Sandmann;Alexander Kompch;V. Mackert;C. Liebscher;M. Winterer
中科院分区：
文献类型：
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作者：
A. Sandmann;Alexander Kompch;V. Mackert;C. Liebscher;M. Winterer
使用氨基酸l-半胱氨酸在水中稳定氧化锌（ZnO）纳米颗粒（NPs）。获得了具有初级颗粒水平上的附聚物尺寸的透明分散体。通过动态光散射（DLS）、pH依赖性zeta电位测量、扫描透射电子显微镜（STEM）、X射线衍射（XRD）、傅里叶变换红外（FTIR）光谱、拉曼光谱、光致发光（PL）光谱和X射线吸收精细结构（EXAFS、XANES）光谱对分散体进行表征。半胱氨酸作为硫的来源以在ZnO核周围形成ZnS壳，并作为这些核-壳NP的稳定剂。观察到对光致发光性质的大的影响：缺陷发光（DL）发射的强度降低超过2个数量级，近带边（NBE）发射的强度增加20%，并且NBE波长随着半胱氨酸浓度的增加而减小，对应于由于Burstein-Moss效应引起的约35 nm的蓝移。
Zinc oxide (ZnO) nanoparticles (NPs) were stabilized in water using the amino acid l-cysteine. A transparent dispersion was obtained with an agglomerate size on the level of the primary particles. The dispersion was characterized by dynamic light scattering (DLS), pH dependent zeta potential measurements, scanning transmission electron microscopy (STEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Raman spectroscopy, photoluminescence (PL) spectroscopy, and X-ray absorption fine structure (EXAFS, XANES) spectroscopy. Cysteine acts as a source for sulfur to form a ZnS shell around the ZnO core and as a stabilizer for these core-shell NPs. A large effect on the photoluminescent properties is observed: the intensity of the defect luminescence (DL) emission decreases by more than 2 orders of magnitude, the intensity of the near band edge (NBE) emission increases by 20%, and the NBE wavelength decreases with increasing cysteine concentration corresponding to a blue shift of about 35 nm due to the Burstein-Moss effect.