Growth of Na_0.3WO₃nanorods for the field emission application

Abstract

Na0.3WO3 1D nanostructure forms (nanorods and nanobelts) were grown by a solid–liquid–solid mechanism from a 40 nm sputtered tungsten film deposited on a soda-lime substrate and annealed at 700 °C in a tubular furnace in N2 ambient. The morphology, structure, composition and chemical state of the prepared nanostructures were characterized by SEM, XRD, TEM, SAED and XPS measurements. The Na0.3WO3 1D nanostructures were found to have a cubic crystalline structure and grown along the [0 0 1] direction. The nanorods are a few micrometres in length and about 50 nm in diameter. The field-emission application of the prepared samples at different distances between the cathode and the anode was characterized in a UHV chamber at room temperature and a field enhancement factor of 1736 at a distance of 350 µm was found.

DNA Facilitates the Sorption of Polycyclic Aromatic Hydrocarbons on Montmorillonites

“…The blue dashed line represents the standard binding energy of each element. The binding energy of Na was only increased from 1072 eV to 1073.18 eV in Na–MMT, but there was little change occurred after the DNA sorption (Figure d). This phenomenon indicates no formation of chemical bond between Na and the O in the DNA phosphate group.…”

Large-scale synthesis and quantitative characterization of size-controllable potassium tungsten bronze nanowires

“…Hexagonal tungsten bronzes M x WO 3 (with 0.19 ⩽ x ⩽ 0.33), formed by WO 6 octahedra sharing corners, possess onedimensional (1D) hexagonal tunnels along the c directions, in which alkali metal or hydrogen ions (M + ions) can be accommodated and drift or diffuse easily, and then exhibit outstanding electronic, chemical and chromic properties [1][2][3][4][5][6][7][8][9][10]. Hexagonal M x WO 3 nanowires grow always along the c direction under normal conditions [11][12][13][14][15][16], and then the M + ions in the 1D tunnels can drift or diffuse easily along the axial direction under external excitation such as electrical field [17]. Therefore, the electrical properties such as the resistance as well as the optical properties such as the color can be well modulated simultaneously by modulating the distribution of the M + ions along the nanowire [18][19][20].…”

Solvothermal Synthesis of Cs0.33WO3/LDHs Composite as a Novel Visible‐Light‐Driven Photocatalyst

“…Tungsten bronzes M x WO 3 with doping small ions such as H + , Li + , Na + , K + and Cs + into WO 3 recently drawn much attention as one of new functional materials for sunlight control due to its better optical and electrical properties . Cs 0.33 WO 3 is often used as a visible–light‐responsive photocatalyst because of its narrow band gap energy (2.5–2.9 eV).…”