基于柔性聚合物薄膜的低维材料定点转移研究

Research on a fixed-site transfer method for low-dimensional materials based on flexible polymer film

针对目前低维材料转移方案中过程复杂和衬底适应性差的难题,提出了一种常温常压下基于柔性聚合物薄膜聚二甲基硅氧烷(polydimethylsiloxane, PDMS)的低维材料定点转移方法。PDMS柔性膜的受力形变是实现其与不同衬底紧密贴合的基础,针对不同的目标衬底,仅需要更换对应的衬底微调系统盖板,结合三维位移机械系统,即可实现一维和二维材料的通用定点转移。该方法避免了转移过程中的真空吸附及衬底加热等严格条件,降低了材料的定点转移难度并提高了其稳定性和通用性。此外该方法也可实现低维材料同质结或其它垂直结构的构建,从而极大提高低维材料结构的丰富性。

To address the challenges of complex process and poor substrate adaptability in current low-dimensional material transfer schemes, a fixed-site transfer method based on flexible polymer film polydimethylsiloxane(PDMS) is proposed in this paper. The deformation of PDMS flexible film is the basis for its close adhesion to different substrates. For different target substrates, only the corresponding substrate micro-adjustment system cover plate need to be replaced, and in combination with the three-dimensional displacement mechanical system, the universal fixed-point transfer of one-dimensional and two-dimensional materials is realized. This method avoid the strict conditions of vacuum adsorption and substrate heating during the transfer process, which effectively reduce the difficulty of the fixed-point transfer of low-dimensional materials and improve the transfer stability and versatility. In addition, this method also enable the construction of homogeneous junctions or other vertical structures of low-dimensional materials, thus greatly improving the structural richness of low-dimensional materials.