증기상에서 투명한 셀룰로오스 나노필름 센서를 이용한 DCP 비색 검출

Abstract

Transparent cellulose nanofiber films (CNFs) were prepared for colorimetric detection of diethyl chlorophosphate (DCP), a nerve agent mimic in the vapor phase. The nanofibrillaion of cellulose was efficiently achieved by aqueous collision counter (ACC) system, followed by succinylation. Horizontal centrifugal casting (HCC) process allows the fabrication of succinylated cellulose nanofiberfilm (SCNF film) with uniform film thickness. DCP receptor, (E)-4-((E)-(4-((2-hydroxyethyl)(methyl)amino)phenyl)diazenyl)benzaldehyde oxime (HEMBAO), was anchored on the surface of SCNF film, leading to the target probe, hereafter referred to as SCNF1 film. SCNF1 film exhibits the selective detection behaviors toward DCP in the vapor phase. Upon exposure to DCP vapor, the oxime groups of SCNF1 film reacted with DCP, which accompanied by a color change from yellow to purple due to enhancement of the intramolecular charge transfer (ICT) effect. Most importantly, the transparency of the film was retained during the entire detection process, enabling it to identify objects behind the film during DCP detection. This property could be generally applicable to the detection system where the color change caused by detection should not interfere with the transparency of the film. The film sensor is biodegradable, allowing it to be disposable after use.