Oh Yongkeun, Kwon Dae-Sung, Jo Eunhwan, Kang Yunsung, Sim Sangjun, Kim Jongbaeg
School of Mechanical Engineering, Yonsei University, Seoul, 03722 Republic of Korea.
Microsyst Nanoeng. 2023 Feb 17;9:15. doi: 10.1038/s41378-022-00459-y. eCollection 2023.
The air suspension and location specification properties of nanowires are crucial factors for optimizing nanowires in electronic devices and suppressing undesirable interactions with substrates. Although various strategies have been proposed to fabricate suspended nanowires, placing a nanowire in desired microstructures without material constraints or high-temperature processes remains a challenge. In this study, suspended nanowires were formed using a thermally aggregated electrospun polymer as a template. An elaborately designed microstructure enables an electrospun fiber template to be formed at the desired location during thermal treatment. Moreover, the desired thickness of the nanowires is easily controlled with the electrospun fiber templates, resulting in the parallel formation of suspended nanowires that are less than 100 nm thick. Furthermore, this approach facilitates the formation of suspended nanowires with various materials. This is accomplished by evaporating various materials onto the electrospun fiber template and by removing the template. Palladium, copper, tungsten oxide (WO), and tin oxide nanowires are formed as examples to demonstrate the advantage of this approach in terms of nanowire material selection. Hydrogen (H) and nitrogen dioxide (NO) gas sensors comprising palladium and tungsten oxide, respectively, are demonstrated as exemplary devices of the proposed method.
纳米线的空气悬浮和定位特性是优化电子器件中的纳米线以及抑制与衬底的不良相互作用的关键因素。尽管已经提出了各种策略来制造悬浮纳米线，但在没有材料限制或高温工艺的情况下将纳米线放置在所需的微结构中仍然是一个挑战。在本研究中，使用热聚集的静电纺丝聚合物作为模板形成悬浮纳米线。精心设计的微结构使得静电纺丝纤维模板能够在热处理期间在所需位置形成。此外，通过静电纺丝纤维模板可以轻松控制纳米线的所需厚度，从而平行形成厚度小于100nm的悬浮纳米线。此外，这种方法有助于形成由各种材料制成的悬浮纳米线。这是通过将各种材料蒸发到静电纺丝纤维模板上并去除模板来实现的。以钯、铜、氧化钨（WO）和氧化锡纳米线为例，证明了该方法在纳米线材料选择方面的优势。分别包含钯和氧化钨的氢气（H）和二氧化氮（NO）气体传感器被证明是该方法的示例性器件。
