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Supercritical Fluids 2014, 85:183–189.CrossRef 44. Sawa A: Resistive switching in transition metal oxides. Mater Today 2008, 11:28–36.CrossRef 45. Schwan J, Ulrich selleck S, Batori V, Ehrhardt H, Silva SRP: Raman spectroscopy on amorphous carbon films. J Appl Phys 1996, 80:440–447.CrossRef 46. Evtukh A, Litovchenko V, Semenenko M, Yilmazoglu O, Mutamba K, Hartnagel HL, Pavlidis D: Formation of conducting nanochannels in diamond-like carbon films. Semicond Sci Technol 2006, 21:1326–1330.CrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions YJC designed and set up the experimental procedure. HLC conducted the electrical measurement of the devices. TCC and TFY planned the experiments and agreed with the paper’s publication. TMT, KCC, KHC, and JCL revised manuscript critically and make some changes. RZ fabricated the devices with the assistance of TJC. JHC performed the Raman and FTIR spectra measurement. DHB and SMS assisted in the data analysis. All authors read and approved the final manuscript.