Tungsten oxide nanowires grown on carbon cloth as a flexible cold cathode.

Figure 1 . a) Optical images of the carbon cloth with TONWs, left-inset and right-inset show the optical images of a carbon cloth with TONWs under slight bending and severe bending, respectively. b,c) SEM images of the carbon cloth before and after growing TONWs, respectively. Inset [∗] X. H. Zhang , Y. Z. Cao , X. Xiao , W. M. Sun , Prof. Y. H. Gao , Prof. J. Zhou , Prof. Z. L. Wang Wuhan National Laboratory for Optoelectronics (WNLO) and College of Optoelectronic Science and Engineering Huazhong University of Science and Technology (HUST) Wuhan, 430074 (P. R. China) E-mail: [email protected]; [email protected] L. Gong , Prof. J. Chen Instrumental Analysis & Research Center Sun Yat-sen University Guangzhou, 510275 (P. R. China) K. Liu , Prof. X. J. Hu School of Power and Mechanical Engineering Wuhan University Wuhan, 430072 (P. R. China) Prof. Z. L. Wang School of Materials Science and Engineering Georgia Institute of Technology Atlanta, Georgia 30332-0245 (USA) Nanowire arrays for fi eld emission have attracted a lot of interest in the last few years because of numerous applications such as fl at-panel displays, X-ray radiotherapy, microwave amplifi ers, and vacuum microelectronic devices. [ 1 , 2 ] The growth of fi eld emitters on fl exible substrates may open up numerous fi elds of applications such as roll-up fi eld emission displays (FEDs), [ 3 ]