Application of Organophosphonic Acids by One-Step Supercritical CO2 on 1D and 2D Semiconductors: Toward Enhanced Electrical and Sensing Performances
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- 作者：Bhavesh Bhartia ; Nadav Bacher ; Sundaramurthy Jayaraman ; Salam Khatib ; Jing Song ; Shifeng Guo ; Cedric Troadec ; Sreenivasa Reddy Puniredd ; Madapusi Palavedu Srinivasan ; Hossam Haick
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：July 15, 2015
- 年：2015
- 卷：7
- 期：27
- 页码：14885-14895
- 全文大小：722K
- ISSN：1944-8252
文摘
Formation of dense monolayers with proven atmospheric stability using simple fabrication conditions remains a major challenge for potential applications such as (bio)sensors, solar cells, surfaces for growth of biological cells, and molecular, organic, and plastic electronics. Here, we demonstrate a single-step modification of organophosphonic acids (OPA) on 1D and 2D structures using supercritical carbon dioxide (SCCO2) as a processing medium, with high stability and significantly shorter processing times than those obtained by the conventional physisorption-chemisorption method (2.5 h vs 48鈥?0 h).The advantages of this approach in terms of stability and atmospheric resistivity are demonstrated on various 2D materials, such as indium鈥搕in-oxide (ITO) and 2D Si surfaces. The advantage of the reported approach on electronic and sensing devices is demonstrated by Si nanowire field effect transistors (SiNW FETs), which have shown a few orders of magnitude higher electrical and sensing performances, compared with devices obtained by conventional approaches. The compatibility of the reported approach with various materials and its simple implementation with a single reactor makes it easily scalable for various applications.