Barbillon Grégory
EPF-Ecole d'Ingénieurs, 55 Avenue du Président Wilson, Cachan 94230, France.
Phys Chem Chem Phys. 2023 Aug 2;25(30):20178-20182. doi: 10.1039/d3cp02910g.
Here, Fermi level shifts of gold nanospheres on zinc oxide (ZnO) film upon UV irradiation are studied. These Fermi level shifts are obtained by recording extinction spectra of gold nanospheres characterized by their plasmon resonance and are due to the presence of additional electrons stored in gold nanospheres and coming from ZnO film upon UV irradiation. It is demonstrated that the blueshift of the plasmon resonance of the Au nanospheres upon UV irradiation points out the transfer of electrons from ZnO film to Au nanospheres. Moreover, it is reported that the Fermi level shifts vary with UV irradiation time by approaching the conduction band of ZnO, and are estimated by an analogous model to the electronic structure of a semiconductor, which can be expressed as a function of the plasmon resonance blueshift of the Au nanospheres. Henceforward, these stored electrons and these Fermi level shifts can allow the improvement of the properties of photocatalytic reduction for the gold-semiconductor structures and can also be used for photo-induced enhanced Raman spectroscopy.
在此，研究了紫外照射下氧化锌（ZnO）薄膜上金纳米球的费米能级移动。这些费米能级移动是通过记录以其等离子体共振为特征的金纳米球的消光光谱获得的，并且是由于紫外照射时存储在金纳米球中且来自ZnO薄膜的额外电子的存在。结果表明，紫外照射下金纳米球等离子体共振的蓝移表明电子从ZnO薄膜转移到金纳米球。此外，据报道，费米能级移动随紫外照射时间变化，趋近于ZnO的导带，并通过与半导体电子结构类似的模型进行估算，该模型可表示为金纳米球等离子体共振蓝移的函数。从今往后，这些存储的电子和这些费米能级移动能够改善金 - 半导体结构的光催化还原性能，还可用于光致增强拉曼光谱。
