Matthews Samantha, Zhao Chuan, Zeng Hao, Bright Frank V
Department of Chemistry, Natural Sciences Complex, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA.
Department of Physics, Fronczak Hall, University at Buffalo, The State University of New York, Buffalo, NY 14260-3000, USA.
Sensors (Basel). 2019 Apr 23;19(8):1913. doi: 10.3390/s19081913.
Two-dimensional (2D) materials are being used widely for chemical sensing applications due to their large surface-to-volume ratio and photoluminescence (PL) emission and emission exciton band tunability. To better understand how the analyte affects the PL response for a model 2D platform, we used atomic force microscopy (AFM) and co-localized photoluminescence (PL) and Raman mapping to characterize tungsten disulfide (WS) flakes on template-stripped gold (TSG) under acetone challenge. We determined the PL-based response from single- and few-layer WS arises from three excitons (neutral, A; biexciton, AA; and the trion, A). The A exciton PL emission is the most strongly quenched by acetone whereas the A PL emission exhibits an enhancement. We find the PL behavior is also WS layer number dependent.
二维（2D）材料因其大的表面体积比、光致发光（PL）发射以及发射激子带的可调性而被广泛用于化学传感应用。为了更好地理解分析物如何影响模型二维平台的PL响应，我们使用原子力显微镜（AFM）以及共定位光致发光（PL）和拉曼映射来表征在丙酮挑战下模板剥离金（TSG）上的二硫化钨（WS）薄片。我们确定了单层和少数层WS基于PL的响应源自三种激子（中性激子，A；双激子，AA；以及三激子，A）。A激子的PL发射被丙酮淬灭得最强烈，而A的PL发射则增强。我们发现PL行为也取决于WS的层数。
