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<p>We investigated the influence of surfactant residues, specifically disodium 4,4’-bis(2-sulfostyryl)biphenyl (DSBP), on the electrical and optical properties of single-wall carbon nanotube (SWCNT) films. Residual DSBP impeded charge flow between SWCNTs through physical interference and moisture adsorption. By systematically varying the DSBP concentration, we demonstrated the feasibility of SWCNT-DSBP films as pressure and leak-detection sensors. Sheet resistance measurements identified an optimal DSBP/SWCNT ratio of 30, which maximized water adsorption sensitivity (32.9% at 10&#xa0;°C, decreasing to 2.3% at 50&#xa0;°C). Photoluminescence analysis revealed exciton transfer saturation at the same ratio, indicating significant van der Waals (VW) interactions. These findings underscore the dual influence of VW forces on the electrical and optical properties of SWCNT-DSBP films, thereby enabling their potential application in novel sensing technologies.&#xa0;</p>

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Study on Vacuum Pressure Leak Sensor Using Water Adsorption Characteristics of Surfactant/SWCNT

  • 期刊论文

  • 发表日期：

    2025年1月9日

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  • Sajal Chakraborty,
  • Sung Il Ahn

摘要

We investigated the influence of surfactant residues, specifically disodium 4,4’-bis(2-sulfostyryl)biphenyl (DSBP), on the electrical and optical properties of single-wall carbon nanotube (SWCNT) films. Residual DSBP impeded charge flow between SWCNTs through physical interference and moisture adsorption. By systematically varying the DSBP concentration, we demonstrated the feasibility of SWCNT-DSBP films as pressure and leak-detection sensors. Sheet resistance measurements identified an optimal DSBP/SWCNT ratio of 30, which maximized water adsorption sensitivity (32.9% at 10 °C, decreasing to 2.3% at 50 °C). Photoluminescence analysis revealed exciton transfer saturation at the same ratio, indicating significant van der Waals (VW) interactions. These findings underscore the dual influence of VW forces on the electrical and optical properties of SWCNT-DSBP films, thereby enabling their potential application in novel sensing technologies.