Our investigations open up the opportunity to use graphene quantum dots as plant growth regulators that can be used in a variety of other food plants for high yield.

Electron emission properties of electrodeposited ZnO nanosheet arrays grown on Indium tin oxide coated glass substrates have been studied. Influence of oxygen vacancies on electronic structures and field emission properties of ZnO nanosheets are investigated using density functional theory. The oxygen vacancies produce unshared d electrons which form an impurity energy state; this causes shifting of Fermi level towards the vacuum, and so the barrier energy for electron extraction reduces. The ZnO nanosheet arrays exhibit a low turn-on field of 2.4 V/μm at 0.1 μA/cm2 and current density of 50.1 μA/cm2 at an applied field of 6.4 V/μm with field enhancement factor, β = 5812 and good field emission current stability. The nanosheet arrays grown by a facile electrodeposition process have great potential as robust high performance vertical structure electron emitters for future flat panel displays and vacuum electronic device applications.

The WSe2 micro/nanorods prepared using microwave and hydrothermal method shows noteworthy performance towards cyclic stability for supercapacitor.

In the present work, we have investigated the charge storage capacitive response and field emission behaviour of platinum (Pt) nanoparticles decorated on carbon nano onions (CNOs) and compared them with those of pristine carbon nano onions.

We report herein the results of our investigations on the synthesis of transition-metal dichalcogenide (TMDC) semiconductor layered materials of MoS 2 , WS 2 , MoSe 2 , and WSe 2 by the rapid quenching method. The bulk powders were added to deionized water in a polypropylene tube and subsequently flushed with argon gas. Thirty rapid freezing (30 s in a liquid nitrogen bath) and heating (20 min in an oil bath at 60°C) cycles were then carried out. The reaction product was obtained in a yield in excess of 60 wt.-%, which indicates that

We report a simple and rapid microwave-assisted synthesis of tantalum telluride (TaTe 2 ) nanosheets. The ratio of tantalum pentachloride (TaCl 5 ) and elemental tellurium (Te) powder were adjusted in the presence of NaBH 4 in such a way as to obtain the TaTe 2 nanosheet. The samples were characterized by various techniques such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), UV/Vis spectroscopy, photoluminescence (PL) spectroscopy, and XRD. Our SEM, TEM, and AFM results show the formation of sheet-like mor-

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Synthesis of vertically well-aligned ZnO nanorods on Au coated silicon substrate by a facile electrochemical route has been carried out. The transformation of as-deposited ZnO nanorods into nanotubes was achieved via simple, single step, chemical etching process using KOH as etchant. The influence of various parameters of the etching, such as concentration of the etchant, bath temperature and duration on morphological features of the ZnO nanotubes has been investigated. It is observed that formation of ZnO nanotubes with smooth inner and outer surfaces is achieved when the etching was performed at 65 • C for 1 h duration, and at higher bath temperatures and longer durations, over etching of nanorods takes place. Field emission investigations of the ZnO nanorods and nanotubes were carried out at base pressure of 1 × 10 −8 mbar. The values of turnon field, corresponding to emission current density of 1 µA/cm 2 were observed to be 7.2 V/µm and 8.4 V/µm, corresponding to ZnO nanorods and nanotubes emitter respectively, and emission current density of ∼ 352.5 µA/cm 2 has been drawn from the ZnO nanotubes emitter at an applied field of 13.77 V/µm. The ZnO nanotubes emitter exhibits excellent emission current stability at the preset value of 1 µA over duration of 3 h, indicating its potential as electron source for practical applications.