디이모늄 염료의 근적외선 흡수 특성과 광열 변환 효과를 이용한 스마트 텍스타일 연구 = Near-Infrared Absorption and Photothermal Conversion Effect of Diammonium Dyes for Smart Textile Applications

다국어 초록 (Multilingual Abstract)

This study synthesized dihexylated diammonium (HDI) dyes incorporating various anions and investigated their effects on the near-infrared (NIR) absorption spectral properties. The anions used for HDI were tetrafluoroborate (BF4-), hexafluorophosphate (PF6-), bis(trifluorosulfonyl)imide (TFSI-), and tetrakis(pentafluorophenyl)borate (TPFB-). These HDI dyes exhibited negative solvatochromism, shifting absorption to shorter wavelengths in polar solvents. In non-polar solvents, molar extinction coefficients varied with anion size andelectronegativity, increasing in the order BF4- < PF6- < TFSI- < TPFB-. In addition, coated fabric samples were prepared to assess the photothermal effect of the TPFB-based HDI dye. When exposed to a 1064 nm laser (1 W/cm2), surface temperature surged to 220 °C within 3 s, even causing carbonization. These results demonstrate that anion selection significantly influences HDI dye’s optical properties and enables superior NIR photothermal conversion. With low visible-light absorption and high NIR absorption, the HDI dye holds promise forsmart textile applications.