Low‐Temperature Fabrication of Cold Cathode WO₂ Nanowire Arrays on Glass Substrate and Improvement of their Working Performance

Abstract

nanowires exhibited the most excellent FE properties due to their high conductivity. [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] On the other hand, for applications in large-area cold-cathode devices, such as X-ray source and flat panel display, glass substrate is preferred due to its low-cost and transparency. However, at present it is a great challenge to grow the WO 2 nanowire arrays on glass substrate at low temperature, although such an issue has been resolved using the Si substrate. [9] Furthermore, whether the WO 2 nanowire arrays grown on glass substrate still maintain comparable emission performances with those on Si substrate is still unknown.In the present study, we report a lowtemperature technique for facilely growing of the WO 2 nanowire cold-cathode arrays on the glass substrate. The field-emission performances of the arrays were scrutinized to unveil their potentials in coldcathode device applications. We managed to reveal the pivotal factors that affected their FE behaviors, whereby the FE performances of the nanowire cold arrays can be strongly improved by finely adjusting the fabrication procedures.

Design Superior Alkaline Hydrogen Evolution Electrocatalyst by Engineering Dual Active Sites for Water Dissociation and Hydrogen Desorption

“…Figure a shows that the two Raman spectra are similar. These peaks match well with the Raman spectra of WO 2 , suggesting that the WO 2 phase exists. , The Raman bands at 287.81 and 785.70 cm –1 result from the W–O–W bending mode and the stretching mode, respectively. Remarkably, compared with those of WO 2 /NF, the peaks of Co–WO 2 /Co x W/NF-1/3 exhibit a red shift, indicating that the state of W–O bonds is changed due to the electronic interactions between WO 2 and Co. To further investigate the surface chemical composition and electronic state of the catalysts, X-ray photoelectron spectroscopy (XPS) was performed.…”

“…These peaks match well with the Raman spectra of WO 2 , suggesting that the WO 2 phase exists. 25,26 The Raman bands at 287. Raman spectra and X-ray photoelectron spectroscopy validate the presence of Co and the strong interaction between it and other elements, in good agreement with the result of XRD patterns and TEM images as well as element mapping.…”

High‐Performance On‐Chip Thermionic Electron Micro‐Emitter Arrays Based on Super‐Aligned Carbon Nanotube Films

“…The emission current density is calculated to be 2.31 mA cm −2 at V driven = 3.05 V. An impressive low emission current fluctuation is observed, the relative standard deviation (RSD) of I collect over 30 min is as small as ±1.2%. Figure b shows the vacuum level and fluctuation of our micro‐emitters, compared with previously reported FEAs . As we can clearly see, emission current fluctuation of FEAs decreases with vacuum level improvement due to suppressed residual gas adsorption and ion back bombardment.…”

Unveiling low-temperature thermal oxidation growth of W18O49 nanowires with metastable β-W films

“…Similar to our findings, the W film possesses a relatively low growth temperature. For example, Tian et al 42 synthesized WO 2 nanowires at 470 °C. Nevertheless, to the best of our knowledge, none of the previous work has illustrated the phase of W precursors.…”

“…Similar to our findings, the W film possesses a relatively low growth temperature. For example, Tian et al 42 synthesized WO 2 nanowires at 470 °C.…”