单壁碳纳米管(SWCNT)因其优异的导电性而众所周知。SWCNT基薄膜的一个有希望的应用是作为用于未冷却的中红外探测器(MIR)的透明电极。在本文中,进行了计算和实验研究的组合,以了解羧酸SWCNT(SWCNT-COOH)分散体在不同溶剂中的稳定性背后的化学性质。基于密度泛函紧密结合(DFTB)方法的计算研究用于了解COOH官能化碳纳米管与所选溶剂的相互作用。注意力集中在理解COOH基团的质子化如何影响SWCNT与不同溶剂之间的结合能。通过在钠钙玻璃基板上交替沉积PEI和SWCNT-COOH来制备薄膜电极。为了制备稳定的SWCNT分散体,测试了不同的溶剂,例如去离子(DI)水,乙醇和丙酮。在不同溶剂中测试SWCNT-COOH分散体稳定性。制备样品以研究沉积数量之间的关系,MIR范围(2.5-5µm)的透明度和电导率,寻找满足应用的最佳厚度。对于最厚的SWCNT层,电极的MIR透明度降低了20%,而薄层电阻值降低到150-200kΩ/sq。
Single-walled carbon nanotubes (SWCNTs) are well-known for their excellent electrical conductivity. One promising application for
SWCNT-based thin films is as transparent electrodes for uncooled mid-IR detectors (MIR). In this paper, a combination of computational and experimental studies were performed to understand the chemistry behind the stability of carboxylic SWCNTs (SWCNTs-COOH) dispersions in different solvents. A computational
study based on the density functional tight-binding (DFTB) method was applied to understand the interactions of COOH-functionalized carbon nanotubes with selected solvents. Attention was focused on understanding how the protonation of COOH groups influences the binding energies between SWCNTs and different solvents. Thin film electrodes were prepared by alternately depositing PEI and SWCNT-COOH on soda lime glass substrates. To prepare a stable SWCNT dispersion, different solvents were tested, such as deionized (DI) water, ethanol and acetone. The
SWCNT-COOH dispersion stability was tested in different solvents. Samples were prepared to
study the relationship between the number of depositions, transparency in the MIR range (2.5-5 µm) and conductivity, looking for the optimal thickness that would satisfy the application. The MIR transparency of the electrode was reduced by 20% for the thickest
SWCNT layers, whereas sheet resistance values were reduced to 150-200 kΩ/sq.