用于氧化还原分子实时光致发光成像的MoS $_{2}$像素阵列
MoS$_{2}$ pixel arrays for real-time photoluminescence imaging of redox molecules
摘要：
测量氧化还原活性分子在空间和时间中的行为对于更好地理解化学和生物系统以及开发新技术至关重要。光学方案是非侵入性的，可扩展的，并且可以应用于许多不同的系统，但是与电检测方法相比通常具有缓慢的响应。此外，许多用于氧化还原检测的荧光分子在长曝光时间内亮度降低。在这里，我们表明，像素阵列的原子薄的二维（2D）材料，单层的MoS $_{2}$的光致发光，可以实时图像氧化还原分子浓度的空间和时间变化。由于MoS $_{2}$光致发光对掺杂的强烈依赖性和对2D材料的表面变化特性的敏感性，局部化学势的变化显著地调制MoS $_{2}$的光致发光，在5 $μ$ m × 5 $μ$ m像素上具有0.9 mV/ $\sqrt{Hz}$的敏感性，对应于在100 ms帧速率下氧化还原分子浓度下降到纳摩尔浓度的好于百分之几的变化。具有快速响应时间的电化学电位实时成像为使用2D材料屏幕可视化化学反应和生物分子提供了新的策略。
英文摘要：
Measuring the behavior of redox-active molecules in space and time is crucial for better understanding of chemical and biological systems and for the development of new technologies. Optical schemes are non-invasive, scalable and can be applied to many different systems, but usually have a slow response compared to electrical detection methods. Furthermore, many fluorescent molecules for redox detection degrade in brightness over long exposure times. Here we show that the photoluminescence of pixel arrays of an atomically thin two-dimensional (2D) material, a monolayer of MoS$_{2}$, can image spatial and temporal changes in redox molecule concentration in real time. Because of the strong dependence of MoS$_{2}$ photoluminescence on doping and sensitivity to surface changes characteristic of 2D materials, changes in the local chemical potential significantly modulate the photoluminescence of MoS$_{2}$, with a sensitivity of 0.9 mV/$\sqrt{Hz}$ on a 5 $μ$m by 5 $μ$m pixel, corresponding to better than parts-per-hundred changes in redox molecule concentration down to nanomolar concentrations at 100 ms frame rates. The real-time imaging of electrochemical potentials with a fast response time provides a new strategy for visualizing chemical reactions and biomolecules with a 2D material screen.
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