title: Work function measurement for Ag-TCNQ (TCNQ = tetracyanoquinodimethane) nanowires.
abstract: The Ag-TCNQ (TCNQ = tetracyanoquinodimethane) nanowires synthesized by a vapor transport reaction exhibit promising field emission properties. Their effective work function at high applied electric field was estimated to be about 1.70 eV according to the Fowler-Nordheim (F-N) theory. In this work, we directly measured the intrinsic work function of Ag-TCNQ nanowires via the ultraviolet photoemission spectroscopy (UPS). According to the threshold binding energy, the work function is obtained to be 5.45 eV, which shows a large discrepancy with the preivous estimation based on F-N theory. The reductive effecitive work function during the field emission is mainly attributed to the morphology-induced enhancement of the nanowire array.
authors.affiliation: Department of Materials Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.
authors.forename: Chunnuan
authors.initials: C
authors.lastname: Ye
authors.forename: Kaibo
authors.initials: K
authors.lastname: Zheng
authors.forename: Guorong
authors.initials: G
authors.lastname: Chen