In view of the worldwide energy challenge in the 21(st) century, the technology of semiconductor-based photoelectrochemical (PEC) water splitting has received considerable attention as an alternative approach for solar energy harvesting and storage. Two-dimensional (2D) structures such as nanosheets have the potential to tap the solar energy by unlocking the functional properties at the nanosca...

Nanocrystalline 3mm thick Cu1–xNix (0.45 £ x £ 0.87) films are electrodeposited galvanostatically onto Cu/Ti/Si (100) substrates, from a citrateand sulphate-based bath containing sodium lauryl sulphate and saccharine as additives. The films exhibit large values of reduced Young’s modulus (173< Er< 192GPa) and hardness (6.4<H< 8.2GPa), both of which can be tailored by varying the alloy compositi...

Wide band gap materials show promise for applications in coating of field emission tips. Recently nanocrystalline hexagonal GaN crystallites as small as 5 nm average diameter have been formed using reactive laser ablation of gallium metal in a nitrogenating ambient. In this paper we have investigated the performance of ungated emitter. Silicon tip arrays coated by dielectrophoresis of gallium n...

Nanocrystalline cellulose is an amphiphilic, high surface area material that can be easily functionalized and is biocompatible and eco-friendly. It has been used singularly and in combination with other nanomaterials to optimize biosensor design. The attachment of peptides and proteins to nanocrystalline cellulose and their proven retention of activity provide a route to bioactive conjugates us...

Interest in nanocrystaJline ceramic powders is due to their attractive processing and mechanical properties. The disadvantages of conventional ceramics, such as large internal flaws, negligible ductility, hightemperature processing, can possibly be eliminated or minimized by starting with finegrained powders. A previous study on the sinterability of nanocrystalline ceramic powders showed that h...

Nanocrystalline nanowires (NCNW) are fragments of bulk crystals that are infinite in only one direction and typically have some rotational symmetry around this direction. Electron eigenstates belonging to the symmetry labels (k,m) (wavevector and rotational quantum number) are discussed. The rotational quantum number simplifies discussion of optical properties. For m not equal 0, the +/-m degen...

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Simple, low temperature and environmentally benign green route is proposed for preparation of nanocrystalline ZnO in presence of a low-cost and halide-free room-temperature ionic liquid (RTIL) by refluxing at 95 °C for 60 minutes. The X-ray diffraction (XRD) studies display that the products are well-crystallized in the form of wurtzite hexagonal. Morphology of the as-prepared ZnO was character...

Wide band-gap materials show promise for applications in coating of field emission tips. Recently nanocrystalline hexagonal GaN crystallites as small as 12 nm average diameter have been formed using reactive laser ablation of gallium metal in nitrogenating ambient @T. J. Goodwin et al., Appl. Phys. Lett. 70, 3122 ~1997!#. In this article we investigated the performance of ungated emitters with ...

High-density (>98% of full density) nanocrystalline invar alloys with significantly enhanced hardness (>240 in Vicker’s hardness) were prepared by sintering compacted Fe-Ni nanoparticles in hydrogen. The precursor Fe-Ni nanoparticles were synthesized by hydrogen plasma evaporation of bulk Fe61Ni39 alloys. The size and the productivity of the Fe-Ni nanoparticles increased with increasing hydroge...