Lok Boon Keng, Ng You Min, Liang Yen Nan, Hu Xiao
School of Materials Science and Engineering, Block N4.1 Nanyang Technological University, 639798, Singapore.
J Nanosci Nanotechnol. 2010 Jul;10(7):4711-5. doi: 10.1166/jnn.2010.1706.
In this paper, multi-walled carbon nanotube (MWCNT) ink was selectively patterned by inkjet printing on substrates to form conductive traces and electrodes for interconnection application. MWCNT was firstly functionalized using concentrated acid and dispersed in deionized water to form a colloidal solution. Various concentrations of MWCNT were formulated to test the stability of the solution. The printability of the MWCNT ink was examined against printing temperature, ink concentration and ink droplet pitch. Rheological properties of the ink were determined by rheometer and sessile drop method. The electrical conductivity of the MWCNT pattern was measured against multiple printing of MWCNT on the same pattern (up to 10 layers). While single layer printing pattern exhibited highest resistance, the CNT entangled together and formed a random network with more printed layers has higher conductivity. The electrical properties of the printed film was compared to a composite ink of CNT and conducting polymer (CNT ink was mixed with conductive polymer solution, Poly(3,4-ethylenedioxythiophene)-Poly(styrenesulfonate) (PEDOT:PSS)). Scanning electron microscopy (SEM) was used to observe the surface structure and atomic force microscopy (AFM) was used to study the morphology of the printed film under different conditions.
在本文中，通过喷墨打印将多壁碳纳米管（MWCNT）墨水选择性地图案化在基板上，以形成用于互连应用的导电迹线和电极。首先使用浓酸对MWCNT进行功能化处理，并将其分散在去离子水中以形成胶体溶液。配制了不同浓度的MWCNT以测试溶液的稳定性。针对打印温度、墨水浓度和墨滴间距对MWCNT墨水的可打印性进行了研究。通过流变仪和静置滴法测定了墨水的流变特性。针对在同一图案上多次打印MWCNT（最多10层）来测量MWCNT图案的电导率。虽然单层打印图案表现出最高的电阻，但随着打印层数增加，碳纳米管相互缠结并形成随机网络，电导率更高。将印刷薄膜的电学性能与碳纳米管和导电聚合物的复合墨水（碳纳米管墨水与导电聚合物溶液聚（3,4-乙撑二氧噻吩）-聚（苯乙烯磺酸盐）（PEDOT:PSS）混合）进行了比较。使用扫描电子显微镜（SEM）观察表面结构，并使用原子力显微镜（AFM）研究不同条件下印刷薄膜的形态。
