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Effects of Acetone Vapor on the Exciton Band Photoluminescence Emission from Single- and Few-Layer WS2 on Template-Stripped Gold

机译:丙酮蒸气对模板剥离金上单层和少层WS2激子带光致发光的影响

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摘要

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 (WS2) flakes on template-stripped gold (TSG) under acetone challenge. We determined the PL-based response from single- and few-layer WS2 arises from three excitons (neutral, A0; biexciton, AA; and the trion, A). The A0 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 WS2 layer number dependent.
机译:二维(2D)材料因其较大的表面积与体积比以及光致发光(PL)发射和发射激子能带可调性而被广泛用于化学传感应用。为了更好地了解分析物如何影响2D模型平台的PL响应,我们使用原子力显微镜(AFM)以及共定位光致发光(PL)和拉曼映射来表征模板剥离金(TSG)上的二硫化钨薄片(WS2) )置于丙酮中。我们确定了来自单层和多层WS2的基于PL的响应来自三个激子(中性,A 0 ; biexciton,AA;三重子,A -) 。 A 0 激子PL发射最强地被丙酮猝灭,而A - PL发射则增强。我们发现PL行为也与WS2层数有关。

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