<br>ZnO-ZnS异质结：光电应用和直射阳光下内分泌干扰物矿化的潜在候选者,ACS Omega

当前位置： X-MOL 学术 › ACS Omega › 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.)

ZnO-ZnS异质结：光电应用和直射阳光下内分泌干扰物矿化的潜在候选者
ACS Omega ( IF 3.7 ) Pub Date : 2017-10-16 00:00:00 , DOI: 10.1021/acsomega.7b01172
Perumal Devaraji ₁ , Maitri Mapa ₁ , Hasna M Abdul Hakkeem ₁ , Vediappan Sudhakar ₂ , Kothandam Krishnamoorthy _{2,

2} , Chinnakonda S Gopinath _{1,

2,

2}

Affiliation

以硝酸锌为氧化剂，尿素和硫脲的混合物为燃料，采用简单的溶液燃烧合成法合成了ZnO-ZnS（ZS x ）纳米复合材料。大的硫脲/尿素比例导致 ZS x中产生更多的 ZnS，并在 ZnS 和 ZnO 之间形成异质结并遍及整个本体；可调的 ZnS 微晶尺寸和织构特性是另一个优势。通过简单地改变硫脲含量即可改变ZS x中ZnS的量。尽管ZnO和ZnS是宽带隙半导体，但ZS x表现出可见光吸收，至少高达525 nm。这表明光学带隙的有效减小及其电子结构的显着变化。拉曼光谱、透射电子显微镜、X射线光电子能谱和二次离子质谱结果显示了ZnO和ZnS的特征，并证实了异质结的复合性质。上述观察结果证明了 ZS x的多功能性质。 Bare ZS x表现出一种有前景的阳光驱动光催化活性，可实现 2,4-二氯苯酚和硫丹等内分泌干扰物的完全矿化。 ZS x在不施加偏压的情况下也表现出光电流产生。使用 ZS x进行的染料敏化太阳能电池性能评估显示效率高达 4%，入射光子转换效率高达 48%。在高分辨率透射电子显微镜中观察到的 ZnO 和 ZnS 纳米晶之间的异质结揭示了电子空穴对有效分离及其利用的原因。

"点击查看英文标题和摘要"

ZnO–ZnS Heterojunctions: A Potential Candidate for Optoelectronics Applications and Mineralization of Endocrine Disruptors in Direct Sunlight

Simple solution combustion synthesis was adopted to synthesize ZnO–ZnS (ZSx) nanocomposites using zinc nitrate as an oxidant and a mixture of urea and thiourea as a fuel. A large thiourea/urea ratio leads to more ZnS in ZSx with heterojunctions between ZnS and ZnO and throughout the bulk; tunable ZnS crystallite size and textural properties are an added advantage. The amount of ZnS in ZSx can be varied by simply changing the thiourea content. Although ZnO and ZnS are wide band gap semiconductors, ZSx exhibits visible light absorption, at least up to 525 nm. This demonstrates an effective reduction of the optical band gap and substantial changes in its electronic structure. Raman spectroscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and secondary-ion mass spectrometry results show features due to ZnO and ZnS and confirm the composite nature with heterojunctions. The above mentioned observations demonstrate the multifunctional nature of ZSx. Bare ZSx exhibits a promising sunlight-driven photocatalytic activity for complete mineralization of endocrine disruptors such as 2,4-dichlorophenol and endosulphan. ZSx also exhibits photocurrent generation at no applied bias. Dye-sensitized solar cell performance evaluation with ZSx shows up to 4% efficiency and 48% incident photon conversion efficiency. Heterojunctions observed between ZnO and ZnS nanocrystallites in high-resolution transmission electron microscopy suggest the reason for effective separation of electron–hole pairs and their utilization.

更新日期：2017-10-16

点击分享查看原文

点击收藏

公开下载

阅读更多本刊新发论文本刊介绍/投稿指南