Nanolaminate coatings of liquid exfoliated 2D materials for mid-infrared optical sensors

用于中红外光学传感器的液体剥离二维材料纳米层压涂层

• 批准号: 542515-2019
• 负责人: Ménard, JeanMichel
• 金额: $ 1.82万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=680936
• 关键词: Nanolaminate; coatings; liquid; exfoliated; 2D

Methods for the fabrication of 2D materials have advanced at an extraordinary pace since the first demonstration of graphene fabrication by peeling Scotch tape off bulk graphite in 2004. Today, there are several main methods of synthesis, each with their own distinct advantages and disadvantages. Liquid Phase Exfoliation (LPE) is a low-cost and scalable method that has proven effective at exfoliating bulk materials into colloidal dispersions of their 2D counterparts. After exfoliation, the solvent screens inter-sheet attractive forces of the 2D material to keep layers apart. LPE is an ideal method for fabricating 2D materials-based inks, thin films and composites. There is a wide range of interesting materials with a large optical absorption in the Mid-Infrared (MIR) region of the electromagnetic spectrum that are LPE compatible such as graphene, titanium diselenide (TiSe2), black phosphorous and bismuth. Raman spectroscopy, transmission electron spectroscopy and electron diffraction of these materials have demonstrated that the resulting films, composed of a randomized arrangement of 2D flakes, maintain properties that can only be attributed to the bi-dimensional nature of the material. In this collaborative project between Kennedy Labs and Dr. Ménard's research group at uOttawa, we propose to fabricate LPE 2D materials for optical sensing application in the mid-infrared region. We will use an established fabrication and purification process and test different deposition techniques such as drop casting and spray coating, which has a great potential for fabricating large 2D materials devices. Deposition of gold electrodes onto the thin films will allow the characterization of their electrical properties as well as provide an interface to detect incident MIR light. An optical characterization setup will be used to test the responsivity, spectral bandwidth, linearity and rise time of the detectors. In the future, our research could lead to the development of large-surface MIR detectors, which could be super-imposed to Si-based solar cells to enhance the overall photovoltaic efficiency.

自2004年首次通过剥离块状石墨的Scotch胶带来制造石墨烯以来，制造2D材料的方法已经以非凡的速度发展。今天，有几种主要的综合方法，每种方法都有自己独特的优点和缺点。液相剥离（LPE）是一种低成本和可扩展的方法，已被证明可有效地将散装材料剥离成其2D对应物的胶体分散体。在剥离之后，溶剂屏蔽2D材料的片间吸引力以保持层分开。LPE是制造基于2D材料的油墨、薄膜和复合材料的理想方法。存在广泛的在电磁波谱的中红外（MIR）区域中具有大的光学吸收的感兴趣的材料，其是LPE兼容的，诸如石墨烯、二硒化钛（TiSe 2）、黑磷和铋。这些材料的拉曼光谱、透射电子光谱和电子衍射表明，由2D薄片的随机排列组成的所得膜保持只能归因于材料的二维性质的性质。在肯尼迪实验室和uOttawa的Ménard博士研究小组之间的这个合作项目中，我们建议制造用于中红外区域光学传感应用的LPE 2D材料。我们将使用已建立的制造和纯化工艺，并测试不同的沉积技术，如滴铸和喷涂，这对制造大型2D材料设备具有很大的潜力。将金电极沉积到薄膜上将允许表征它们的电特性以及提供检测入射MIR光的界面。光学表征装置将用于测试探测器的响应度、光谱带宽、线性度和上升时间。在未来，我们的研究可能会导致大面积MIR探测器的开发，这些探测器可以叠加到硅基太阳能电池上，以提高整体光伏效率。