We report comparative field electron emission (FE) studies on a large-area array of two-dimensional MoS 2 -coated @ one-dimensional (1D) brookite (β) TiO 2 nanorods synthesized on Si substrate utilizing hot-filament metal vapor deposition technique and pulsed laser deposition method, independently. The 10 nm wide and 760 nm long 1D β-TiO 2 nanorods were coated with MoS 2 layers of thickness ∼4 (±2), 20 (±3), and 40 (±3) nm. The turn-on field ( E on ) of 2.5 V/μm required to a draw current density of 10 μA/cm 2 observed for MoS 2 -coated 1D β-TiO 2 nanorods emitters is significantly lower than that of doped/undoped 1D TiO 2 nanostructures, pristine MoS 2 sheets, MoS 2 @SnO 2 , and TiO 2 @MoS 2 heterostructure-based field emitters. The orthodoxy test confirms the viability of the field emission measurements, specifically field enhancement factor (β FE ) of the MoS 2 @TiO 2 /Si emitters. The enhanced FE behavior of the MoS 2 @TiO 2 /Si emitter can be attributed to the modulation of the electronic properties due to heterostructure and interface effects, in addition to the high aspect ratio of the vertically aligned TiO 2 nanorods. Furthermore, these MoS 2 @TiO 2 /Si emitters exhibit better emission stability. The results obtained herein suggest that the heteroarchitecture of MoS 2 @β-TiO 2 nanorods holds the potential for their applications in FE-based nanoelectronic devices such as displays and electron sources. Moreover, the strategy employed here to enhance the FE behavior via rational design of heteroarchitecture structure can be further extended to improve other functionalities of various nanomaterials.

The nano-heteroarchitecture of Au@ZnO evidencing the surface attachment without chemical reaction at the interface delivered enhanced PEC activities by facilitating the injection of hot electrons from the SP state into the conduction band of ZnO.

We reported the investigation on the effect of Li-ion cycling on the vertically aligned brookite (β) TiO 2 nanorods coated on Cu substrate as a Li-ion battery electrode. The vertically grown β-TiO 2 nanorods synthesized over large area array using hot filament metal vapor deposition (HFMVD) technique were ∼ 19 nm in diameter with well-defined textural boundaries. Xray photoelectron spectroscopy revealed the formation of stoichiometric β-TiO 2 nanorods and Raman spectroscopy revealed the formation of pure brookite phase, and not accompanied by the anatase and/or rutile phases. The β-TiO 2 nanorods showed good electrochemical performance with the appearance of the potential plateau at 1.8 and 2.1 V during Li insertion and desertion. The initial discharge/charge capacities of ∼ 81 (52 μAh cm À 2 μm À 1 ) and ∼ 72 mAhg À 1 (45 μAh cm À 2 μm À 1 ) obtained at the current density of 33 mAg À 1 were retained further to ∼ 62 mAhg À 1 (40 μAh cm À 2 μm À 1 ) until the 200th cycle. The exceptional cycling performance of β-TiO 2 nanorods with a high coulombic efficiency of greater than ∼ 98% confirms their potentials as a competent electrode for Li-ion rechargeable batteries.

The morphology of NiO (1D nanobelts and 2D nanosheets) has a significant effect on the pseudocapacitive performance. The perforated and interlinked mesoporous structure of NiO nanobelts delivered higher power and energy density than nanosheets.

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