Reiser B, González-García L, Kanelidis I, Maurer J H M, Kraus T
INM - Leibniz Institute for New Materials , Campus D2 2 , 66123 Saarbrücken , Germany . Email:
Chem Sci. 2016 Jul 1;7(7):4190-4196. doi: 10.1039/c6sc00142d. Epub 2016 Mar 15.
Metal-based nanoparticle inks for printed electronics usually require sintering to improve the poor electron transport at particle-particle interfaces. The ligands required for colloidal stability act as insulating barriers and must be removed in a post-deposition sintering step. This complicates the fabrication process and makes it incompatible with many flexible substrates. Here, we bind a conjugated, electrically conductive polymer on gold nanorods (AuNRs) as a ligand. The polymer, poly[2-(3-thienyl)-ethyloxy-4-butylsulfonate] (PTEBS), provides colloidal stability and good electron transport properties to stable, sintering-free inks. We confirm that the polymer binds strongly through a multidentate binding motif and provides superior colloidal stability in polar solvents over months by IR and Raman spectrometry and zeta potential measurements. We demonstrate that the developed ligand exchange protocol is directly applicable to other polythiophenes such as poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS). Films of AuNRs coated with above polymers reached conductivities directly after deposition comparable to conventional metal inks after ligand removal and retained their conductivity for at least one year when stored under ambient conditions.
用于印刷电子的金属基纳米颗粒墨水通常需要烧结，以改善颗粒间界面处较差的电子传输。胶体稳定性所需的配体充当绝缘屏障，必须在沉积后烧结步骤中去除。这使制造过程变得复杂，并使其与许多柔性基板不兼容。在此，我们将一种共轭导电聚合物作为配体结合在金纳米棒（AuNRs）上。该聚合物聚[2-(3-噻吩基)-乙氧基-4-丁基磺酸盐]（PTEBS）为稳定的无烧结墨水提供了胶体稳定性和良好的电子传输性能。我们通过红外光谱和拉曼光谱以及zeta电位测量证实，该聚合物通过多齿结合基序强烈结合，并在极性溶剂中提供了数月的优异胶体稳定性。我们证明，所开发的配体交换方案可直接应用于其他聚噻吩，如聚（3,4-亚乙二氧基噻吩）：聚苯乙烯磺酸盐（PEDOT:PSS）。涂覆上述聚合物的AuNRs薄膜在沉积后直接达到与去除配体后的传统金属墨水相当的电导率，并且在环境条件下储存时至少一年内保持其电导率。
