Sensitive Detection of Separated Charges in Nanohybrids by Laser Excitation Mass Spectrometry with Tetrabutylammonium Cationic Probe.,Analytical Chemistry

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Sensitive Detection of Separated Charges in Nanohybrids by Laser Excitation Mass Spectrometry with Tetrabutylammonium Cationic Probe.
Analytical Chemistry ( IF 6.7 ) Pub Date : 2020-07-09 , DOI: 10.1021/acs.analchem.0c01934
Yu-Hong Cheng ₁ , Kwan-Ming Ng _{1,

2,

3}

Affiliation

Charge separation lays the foundation for photocatalysis and photovoltaics, in which the catalytic/voltaic efficiency is primarily related to the amount of separated charges generated. Yet, direct experimental approaches for the quantification of separated charges are very limited, especially for nanostructures in small quantities. Here, by laser excitation mass spectrometry with tetrabutylammonium as a sensitive probe, the separated charges in gold–metal sulfide core–shell nanostructures are determined and correlated with the bandgap of the semiconductor shell. Moreover, the separated charges formed can already be detected unambiguously in only an attomole-level of nanoparticles (i.e., 1 × 10⁸ NPs).

中文翻译：

用四丁基铵阳离子探针通过激光激发质谱法灵敏地检测纳米杂化物中的分离电荷。

电荷分离为光催化和光伏技术奠定了基础，其中催化/电压效率主要与产生的分离电荷量有关。但是，用于分离电荷定量的直接实验方法非常有限，特别是对于少量纳米结构。在这里，通过以四丁基铵为敏感探针的激光激发质谱法，确定了金-金属硫化物核-壳纳米结构中分离的电荷，并将其与半导体壳的带隙相关联。而且，已经形成的分离电荷仅在原子水平的纳米颗粒（即1×10 ⁸ NPs）中已经可以被明确地检测到。

更新日期：2020-08-04

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