All Publications


  • Enhanced Process Integration and Device Performance of Carbon Nanotubes via Flocculation SMALL METHODS Gao, T. Z., Lei, T., Molina-Lopez, F., Bao, Z. 2018; 2 (10)
  • Universal Selective Dispersion of Semiconducting Carbon Nanotubes from Commercial Sources Using a Supramolecular Polymer. ACS nano Chortos, A., Pochorovski, I., Lin, P., Pitner, G., Yan, X., Gao, T. Z., To, J. W., Lei, T., Will, J. W., Wong, H. P., Bao, Z. 2017

    Abstract

    Selective extraction of semiconducting carbon nanotubes is a key step in the production of high-performance, solution-processed electronics. Here, we describe the ability of a supramolecular sorting polymer to selectively disperse semiconducting carbon nanotubes from five commercial sources with diameters ranging from 0.7 to 2.2 nm. The sorting purity of the largest-diameter nanotubes (1.4 to 2.2 nm; from Tuball) was confirmed by short channel measurements to be 97.5%. Removing the sorting polymer by acid-induced disassembly increased the transistor mobility by 94 and 24% for medium-diameter and large-diameter carbon nanotubes, respectively. Among the tested single-walled nanotube sources, the highest transistor performance of 61 cm(2)/V·s and on/off ratio >10(4) were realized with arc discharge carbon nanotubes with a diameter range from 1.2 to 1.7 nm. The length and quality of nanotubes sorted from different sources is compared using measurements from atomic force microscopy and Raman spectroscopy. The transistor mobility is found to correlate with the G/D ratio extracted from the Raman spectra.

    View details for DOI 10.1021/acsnano.7b01076

    View details for PubMedID 28528552

  • Enhanced Conductivity, Adhesion, and Environmental Stability of Printed Graphene Inks with Nitrocellulose CHEMISTRY OF MATERIALS Secor, E. B., Gao, T. Z., Islam, A. E., Rao, R., Wallace, S. G., Zhu, J., Putz, K. W., Matuyama, B., Hersam, M. C. 2017; 29 (5): 2332-2340
  • Electrophoretically deposited graphene oxide and carbon nanotube composite for electrochemical capacitors NANOTECHNOLOGY Ajayi, O. A., Guitierrez, D. H., Peaslee, D., Cheng, A., Gao, T., Wong, C. W., Chen, B. 2015; 26 (41)

    Abstract

    We report a scalable one-step electrode fabrication approach for synthesizing composite carbon-based supercapacitors with synergistic outcomes. Multi-walled carbon nanotubes (MWCNTs) were successfully integrated into our modified electrophoretic deposition process to directly form composite MWCNT-GO electrochemical capacitor electrodes (where GO is graphene oxide) with superior performance to solely GO electrodes. The measured capacitance improved threefold, reaching a maximum specific capacitance of 231 F g(-1). Upon thermal reduction, MWCNT-GO electrode sheet resistance decreased by a factor of 8, significantly greater than the 2× decrease of those without MWCNTs.

    View details for DOI 10.1088/0957-4484/26/41/415203

    View details for Web of Science ID 000363433700004

    View details for PubMedID 26403850