Modified 2D Silicon Nanosheets in Electronics: From Synthesis to Application

Silicon nanosheets (SiNSs) are a fairly new class of 2D materials. But they are baring a great potential in terms of physical properties, such as band gap and conductivity control.[1], [2] Nevertheless, oxygen and UV light tend to destroy the two-dimensional material within seconds.[3], [4] To protect the surface, different covalent hydrosilylation reactions with a variety of functional molecules have been carried out to introduce stabilization of the sheets in ambient conditions. Thus, hybrid systems based on organic molecules and inorganic nanosheets were synthesized, which maintain both materials properties. The increase in lifetime is a major advantage, gained with the help of the surface chemistry.[5] This advantage can be used for the fabrication of new nanohybrid systems based electronics with faster performances. Even flexible surfaces can be used, bringing these studies closer to the so called wearables. In this connection, we present not only the first prototype of a highly sensitive photonic sensor[6], but also solution-gated field-effect transistors, which performance is controllable via SiNSs’ surface groups.[7] Furthermore, a capacitive humidity sensor will be presented, which is currently being developed. It shows first steps towards surrounding molecules detection. Monitoring of the conditions, based on water and temperature control, can be performed. In summary, a facile integration of the herewith presented modified SiNSs into the already well-known fabrication methods could allow the manufacturing of even more various (opto)electronic devices. [1] H. Okamoto et al. “Synthesis and modification of silicon nanosheets and other silicon nanomaterials.,” Chemi. Eur. J., vol. 17, no. 36, pp. 9864–87, Aug. 2011. [2] C. Grazianetti et al. “Silicon Nanosheets: Crossover between Multilayer Silicene and Diamond-like Growth Regime,” ACS Nano, p. acsnano.7b00762, 2017. [3] T. Helbich et al. “Radical-Induced Hydrosilylation Reactions for the Functionalization of Two-Dimensional Hydride Terminated Silicon Nanosheets,” Chem. - A Eur. J., p. Chem. Eur. J. 10.1002/chem.201505134, 2016. [4] T. Helbich et al. “Diaryliodonium salts as hydrosilylation initiators for the surface functionalization of silicon nanomaterials and their collaborative effect as ring opening polymerization initiators,” Nanoscale, vol. 9, no. 23, 2017. [5] T. Helbich et al. “One-Step Synthesis of Photoluminescent Covalent Polymeric Nanocomposites from 2D Silicon Nanosheets,” Adv. Funct. Mater., vol. 26, no. 37, pp. 6711–6718, 2016. [6] A. Lyuleeva et al. “Polymer-silicon nanosheet composites: bridging the way to optoelectronic applications,” J. Phys. D. Appl. Phys., vol. 50, no. 13, p. 135106, 2017. [7] T. Helbich et al. “Lewis Acid Induced Functionalization of Photoluminescent Two-Dimensional Silicon Nanosheets for the Fabrication of Functional Hybrid Films,” Adv. Funct. Mater., p. 1606764, 2017     «

Silicon nanosheets (SiNSs) are a fairly new class of 2D materials. But they are baring a great potential in terms of physical properties, such as band gap and conductivity control.[1], [2] Nevertheless, oxygen and UV light tend to destroy the two-dimensional material within seconds.[3], [4] To protect the surface, different covalent hydrosilylation reactions with a variety of functional molecules have been carried out to introduce stabilization of the sheets in ambient conditions. Thus, hybrid s...     »