A monolayer graphene sheets have been prepared via sonochemical approach. Nanocomposites made of graphene doped polysilicon were prepared via mill-roll approach to develop 2D-assembled graphene monolayers aligned parallel in the polysilicon matrices, specifically for ultrasensitive mechanical sensor devices. The developed nanocomposites were characterized via SEM, XRD, FTIR and Raman spectroscopy. It was found that the graphene tended to align parallel in the polysilicon matrices, where Si-H and Si-C bonds between the graphene and polysilicon was formed. Moreover, the increase of graphene contents into the polysilicon matrices instigated a decrease of the amorphous silicon bands and increasing the crystalline Si-C bands. The distance between the aligned graphene layers was strongly dependent on the amount of graphene incorporated in the polysilicon. The mechanical measurements were analyzed based on Ogden and Halpin–Tsai models. These two models indicated that the graphene aligned parallel in the polysilicon matrices and their modulus of elasticity is increased by 10 times at concentration of 0.15 wt%, only. The dissipation energy and linear damage factor were determined under the cyclic stress-strain fatigue. The prepared nanocomposites were examined as mechanical strain sensor. Among all samples, the doping of polysilicon with 0.09 wt% of graphene resulted in a highly sensitive mechanical strain sensor with linear regression up to 22 %. This sample exhibited fast response time of 4−5 s and very fast recovery time around 2−3 s. Therefore, this developed sensor will pave the way to manufacture ultrasensitive mechanical sensor for real daily life use.

已经通过声化学方法制备了单层石墨烯片。由石墨烯掺杂的多晶硅制成的纳米复合材料是通过轧辊法制备的，以开发在多晶硅矩阵中平行排列的二维组装石墨烯单层，特别是用于超灵敏机械传感器设备。通过SEM，XRD，FTIR和拉曼光谱对已开发的纳米复合材料进行了表征。发现石墨烯倾向于在多晶硅基质中平行排列，其中在石墨烯和多晶硅之间形成Si-H和Si-C键。此外，石墨烯含量增加到多晶硅基质中导致非晶硅带的减少和晶体Si-C带的增加。排列的石墨烯层之间的距离强烈地取决于在多晶硅中掺入的石墨烯的量。根据Ogden和Halpin-Tsai模型对机械测量进行了分析。这两个模型表明，石墨烯在多晶硅基质中平行排列，并且其弹性模量仅在浓度为0.15 wt％时增加了10倍。确定了循环应力-应变疲劳下的耗散能和线性损伤因子。检查制备的纳米复合材料作为机械应变传感器。在所有样品中，用0.09 wt％的石墨烯掺杂多晶硅导致了高度灵敏的机械应变传感器，线性回归高达22％。该样品的响应时间为4-5 s，恢复时间非常快，约为2-3 s。因此，