Understanding the noble metal modifying effect on In2O3 nanowires: highly sensitive and selective gas sensors for potential early screening of multiple diseases†,Nanoscale Horizons

当前位置： X-MOL 学术 › Nanoscale Horiz. › 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.)

Understanding the noble metal modifying effect on In2O3 nanowires: highly sensitive and selective gas sensors for potential early screening of multiple diseases†
Nanoscale Horizons ( IF 8.0 ) Pub Date : 2019-07-25 , DOI: 10.1039/c9nh00404a
Wei Liu _{1,

2,

3,

4,

5} , Jiao Sun _{3,

4,

5,

6,

7} , Lin Xu _{1,

2,

3,

4,

5} , Shidong Zhu _{1,

2,

3,

4,

5} , Xiangyu Zhou _{1,

2,

3,

4,

5} , Shuo Yang _{1,

2,

3,

4,

5} , Biao Dong _{1,

2,

3,

4,

5} , Xue Bai _{1,

2,

3,

4,

5} , Geyu Lu _{1,

2,

3,

4,

5} , Hongwei Song _{1,

2,

3,

4,

5}

Affiliation

Detection of multiple volatile organic compounds in human exhaled breath using semiconductor oxide-based sensing devices has attracted increasing attention for the early diagnosis of diseases. However, detecting trace levels of exhaled biomarkers with high sensitivity and selectivity remains a challenge and the corresponding mechanism for the selectivity is still unclear. Herein, ultrafine In₂O₃ nanowires (NWs) modified with Au, Ag, and Pt noble metal nanoparticles (NMNPs) are synthesized using the electrospinning method and are used to build semiconductor sensors. It is exciting to observe that the introduction of NMNPs can not only enhance the sensing performance, but also effectively adjust the selectivity. The Au-, Ag- and Pt-modified In₂O₃ NW sensors exhibit excellent selectivity to hydrogen sulfide, formaldehyde, and acetone biomarkers, respectively. To completely understand the mechanism, theoretical simulation is performed based on density functional theory, which demonstrated that the specific absorption energies between the modified In₂O₃ NWs and the target gases along with the “spillover effect” resulted in excellent specific selectivity. Importantly, the NMNP modified In₂O₃ NW sensors are successfully used to build a sensor array for effective simultaneous detection of simulated exhaled breath. The present work provides a simple, low-cost, effective tool for early screening of halitosis, breast cancer, and diabetes at the same time and an in-depth understanding of the enhanced sensing performance by the introduction of NMNPs.

中文翻译：

了解贵金属对In ₂ O ₃纳米线的修饰作用：高灵敏度和选择性的气体传感器，可用于多种疾病的早期筛查†

使用基于半导体氧化物的传感设备检测人类呼出气中的多种挥发性有机化合物，已引起人们对疾病早期诊断的越来越多的关注。然而，以高灵敏度和选择性检测痕量呼出的生物标志物仍然是一个挑战，选择性的相应机制仍不清楚。在此，使用电纺丝法合成了用Au，Ag和Pt贵金属纳米颗粒（NMNP）改性的In ₂ O ₃纳米线（NWs），并将其用于构建半导体传感器。令人兴奋的是，引入NMNP不仅可以增强传感性能，而且可以有效地调节选择性。Au，Ag和Pt改性的In ₂ O ₃NW传感器分别对硫化氢，甲醛和丙酮生物标志物表现出出色的选择性。为了完全理解该机理，基于密度泛函理论进行了理论模拟，结果表明，改性的In ₂ O ₃ NW与目标气体之间的比吸收能以及“溢出效应”导致出色的比选择性。重要的是，NMNP修饰了In ₂ O ₃NW传感器已成功用于构建传感器阵列，以有效地同时检测模拟的呼气。本工作为同时早期诊断口臭，乳腺癌和糖尿病提供了一种简单，低成本，有效的工具，并通过引入NMNP对增强的传感性能进行了深入的了解。

更新日期：2019-10-21

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南