A direct Z-scheme ZnS/Co9S8 heterojunction-based photoelectrochemical sensor for the highly sensitive and selective detection of chlorpyrifos,Environmental Science: Nano

当前位置： X-MOL 学术 › Environ. Sci.: Nano › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

A direct Z-scheme ZnS/Co9S8 heterojunction-based photoelectrochemical sensor for the highly sensitive and selective detection of chlorpyrifos
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020/01/16 , DOI: 10.1039/c9en01265f
Shi-Hua Chen _{1,

2,

3,

4,

5} , Xiang-Yu Xiao _{1,

2,

3,

4,

5} , Pei-Hua Li _{1,

2,

3,

4,

5} , Yi-Xiang Li _{1,

2,

3,

4,

5} , Meng Yang _{1,

2,

3,

4} , Zheng Guo _{6,

7,

8,

9} , Xing-Jiu Huang _{1,

2,

3,

4,

5}

Affiliation

The detection of chlorpyrifos is of great importance due to its massive usage and serious toxic effects on human health and the ecosystem. Although fruitful achievements have been made in the photoelectrochemical (PEC) sensing of chlorpyrifos, the construction of a label-free PEC interface with high sensitivity and selectivity still faces serious challenges. In this work, we design a direct Z-scheme ZnS/Co₉S₈ heterojunction with hollow cubic structures, and the PEC sensor based on such materials achieves the highly sensitive and selective detection of chlorpyrifos through the inhibition to the photoresponse of ZnS/Co₉S₈ by chlorpyrifos. For sensitivity, the hollow cubic structures of the heterojunction increase the light absorption, and the formation of a direct Z-scheme of the photocatalysts greatly improves the spatial separation of photogenerated charge carriers, thus achieving better PEC activity and higher photocurrent response of the heterojunction than those of individual materials. It shows a wide linear range from 0.05 ppb to 40 ppb with a detection limit as low as 0.0166 ppb (defined as S/N = 3). In particular, the specific interaction between ZnS/Co₉S₈ and N and S atoms of chlorpyrifos creates the high selectivity for chlorpyrifos. In addition, the PEC sensor is still stable after storage for two weeks.

中文翻译：

基于Z方案ZnS / Co9S8异质结的直接光电化学传感器，用于毒死os的高灵敏度和选择性检测

由于毒死rif的大量使用以及对人体健康和生态系统的严重毒性作用，毒死rif的检测非常重要。尽管在毒死rif的光电化学（PEC）传感方面已经取得了丰硕的成果，但是具有高灵敏度和选择性的无标记PEC界面的构建仍然面临严峻挑战。在这项工作中，我们设计了具有空心立方结构的直接Z方案ZnS / Co ₉ S ₈异质结，基于这种材料的PEC传感器通过抑制ZnS / Co的光响应来实现毒死rif的高灵敏度和选择性检测₉小号₈由毒死rif。为了提高灵敏度，异质结的空心立方结构增加了光吸收，光催化剂的直接Z方案的形成极大地改善了光生电荷载流子的空间分离，从而获得了比异质结更好的PEC活性和更高的光电流响应个别材料的那些。它显示了从0.05 ppb到40 ppb的宽线性范围，检出限低至0.0166 ppb（定义为S / N = 3）。特别是，毒死rif的ZnS / Co ₉ S ₈与N和S原子之间的特定相互作用产生了毒死rif的高选择性。此外，PEC传感器在存放两周后仍保持稳定。

更新日期：2020-03-21

点击分享查看原文

点击收藏

阅读更多本刊最新论文