Abstract Materials with pressure-induced luminescence is a type of important energy-storage materials that can release the stored energy in form of light upon an external mechanical stimulus, which can be used for light sources, visualization of stress distribution and mapping of dynamic pressure of the materials. However, using such type of materials as the wearable applications to monitor health problems receives little attention in the previous works. Herein, the mechanoluminescent (ML) materials, i.e., ZnS:Mn2+, with an broad emission band peaking at 586 nm upon excitation at 320 nm, are prepared by using an auto-clave method by addition of Na2S to a solution containing Zinc Oleate and Mn(NO3)2. Since the pure ZnS:Mn2+ can release the ML under external press, here we have coupled it with the 2D graphene to form 2D graphene-coupled ZnS:Mn2+ mechanodetector in order to make the ZnS:Mn2+ having the supercapacity property and keep the heart rate monitoring when there is no external press. The crystal structure, photoluminescence, ML and electrochemical properties of ZnS:Mn2+ with and without 2D graphene are characterized by several techniques, including X-ray diffraction, transmission electron microscopy (TEM), photoluminescence (PL) and pressure-induced ML spectra, galvanostatic charge-discharge and cyclic voltammetry. Our findings reveal that 2D graphene-coupled ZnS:Mn2+ possesses pressure-controlled luminescence. By dispersing highly conductive polyoxometalate (POM) into graphene-coupled ZnS:Mn2+ and then detecting the relative ML intensity and pressure value, we find the ML intensity and pressure value feature a linear relationship within a certain range and can basically come back its original state after several cycles. Due to the introduction of the conductive 2D graphene and POM, the graphene-coupled ZnS:Mn2+ is not only sensitive to the external mechanical stimulus but also can possess the electric conduction due to the supercapacity property. The heart rate monitoring results of the device show great potential for the wearable applications to monitor human health problem.

中文翻译：

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用于心率监测的柔性 2D 石墨烯耦合 ZnS:Mn2+ 机械探测器

摘要 压致发光材料是一类重要的储能材料，可在外界机械刺激下以光的形式释放储存的能量，可用于光源、应力分布的可视化和动态压力的映射。材料。然而，使用此类材料作为可穿戴应用程序来监测健康问题在以前的工作中很少受到关注。在本文中，机械发光 (ML) 材料，即 ZnS:Mn2+，在 320 nm 激发时在 586 nm 处具有宽发射带峰值，通过使用高压釜方法通过将 Na2S 添加到含有油酸锌和Mn(NO3)2。由于纯 ZnS:Mn2+ 可以在外部压力下释放 ML，这里我们将其与 2D 石墨烯耦合以形成 2D 石墨烯耦合 ZnS：Mn2+ 机械探测器为了使ZnS:Mn2+ 具有超容量特性并在没有外部压力的情况下保持心率监测。含和不含 2D 石墨烯的 ZnS:Mn2+ 的晶体结构、光致发光、ML 和电化学性质通过多种技术表征，包括 X 射线衍射、透射电子显微镜 (TEM)、光致发光 (PL) 和压力诱导 ML 光谱、恒电流充放电和循环伏安法。我们的研究结果表明，二维石墨烯耦合的 ZnS:Mn2+ 具有压力控制的发光。通过将高导电性多金属氧酸盐 (POM) 分散到石墨烯耦合的 ZnS:Mn2+ 中，然后检测相对 ML 强度和压力值，我们发现ML强度和压力值在一定范围内呈线性关系，经过几次循环后基本可以恢复到原来的状态。由于引入了导电的二维石墨烯和 POM，石墨烯耦合的 ZnS:Mn2+ 不仅对外部机械刺激敏感，而且由于超容量特性而具有导电性。该设备的心率监测结果显示了可穿戴应用监测人类健康问题的巨大潜力。