Polarity Determination for the CdxZn1-xS Nanocombs by EELS

Abstract

Comb-like Cd(x)Zn(1-x)S nanostructures have been synthesized by one-step metallo-organic chemical vapor deposition (MOCVD). The microstructure and composition were characterized by analytical transmission electron microscopy (TEM). The ribbon of the comb-like structure is along [2-1-10] (the a-axis), and the nanotips are along [0001] (the c-axis). The atomic location by channeling-enhanced microanalysis (ALCHEMI) technique was used to determine the polarity of the crystal via electron energy-loss spectroscopy (EELS). The thickness dependence, delocalization and beam convergent effect are discussed here. The investigations reveal that the growth mechanism is consistent with the asymmetric growth.

Recent Developments in One‐Dimensional Inorganic Nanostructures for Photodetectors

“…Recent advances in ternary semiconductor nanostructures have shown that their band gaps and thus their physical properties can be tuned by changing their stoichiometries 110–112. Chio and co‐workers fabricated variable‐wavelength photodetectors by a selective growth of Zn x Cd 1‐ x Se NWs on patterned Au catalysts thus forming NW air‐bridges between two Pt pillar electrodes.…”

One-dimensional CdS nanostructures: synthesis, properties, and applications

“…Lee and co-workers fabricated Zn x Cd 1Àx S nanoribbons of variable compositions (0 # x # 1) by combining laser ablation of CdS and thermal evaporation of ZnS at 950 C. 82 The Zn x Cd 1Àx S nanoribbons had thicknesses of 50-80 nm, widths of 0.5-5.0 mm, and lengths up to several hundreds of micrometres. Recently, we developed a low-temperature route for the preparation of singlecrystalline ternary Zn x Cd 1Àx S nanocombs and zigzag NWs via a one-step MOCVD route by heating a mixture of Zn(S 2 CNEt 2 ) 2 and Cd(S 2 CNEt 2 ) 2 powders to 400-420 C. [83][84][85] Fig. 10a shows the typical growth of a comb-like structure, with one side flat and the other side with short nanoteeth.…”

A Review on Less-common Nanostructures

“…[271] Nanocombs are generally represented by ZnO [272] (applied as biosensor for glucose detection [273] ). Among a few other examples, we mention SiC, [274] comb-like Cd x Zn 1−x S nanostructures, synthesized by one-step metallo-organic chemical vapor deposition (MOCVD), [275] and well-defined gold nanobelts as well as unique gold nanocombs made of nanobelts, which were readily synthesized by the reduction of HAuCl 4 with ascorbic acid in aqueous mixed solnutions of the cationic surfactant cetyltrimethylammonium bromide and the anionic surfactant sodium dodecylsulfonate and the electrodes modified on their basis showed an enhanced electrocatalytical activity. [276] As well as for several nanostructures above, nanofans were reported mostly for ZnO and Au.…”