ZnO nanowires growth direction and parameters affecting their surface morphology

ZnO nanowires (or nanorods) have been widely studied due to their unique material properties and remarkable performance in electronics, optics, and photonics. This chapter presents a review of the current research of ZnO nanowires (or nanorods) synthesized by hydrothermal method. We discussed the mechanism of its nucleation and growth taking the effect of different parameters on its growth direction and their final morphology into account. A mixture of zinc nitrate and hexamine as precursor is the most popular. We reported the effect of precursor type and concentration, pH of the growth solution, bath temperature, substrate type and seeded layer, and duration time.

The Liquid Phase Deposition of ZnPtBNs: Study on Structural, Morphology, and Their Sheet-Resistant

This paper reports ZnPt bimetallic nanoparticles (ZnPtBNs) synthesis through the liquid phase deposition (LPD) of of Zn(NO3)2.6H2O onto the indium-titanium oxide (ITO) substrates at various concentrations. The Effects of growth solution, the morphology, structural, and sheet resistance were studied. After preparation, the materials were characterized by using field emission electron microscopy (FESEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD) and Four Point Probe (FPP) measurement by using Keithley 2401 source-meter. By inserting a growth solution into the ITO substrate the ZnPtBNs was successfully in-situ prepared. The synthesized ZnPtBNs exhibited homogeneous, fibrous at the (111) orientation with an average diameter of 100-700 nm. The atomic ratio of Zn:Pt and sheet resistance of ZnPtBNs decreased with the increase of Zn(NO3)2.6H2O concentration. The optimal elemental composition of the sample was at a ratio of Zn:Pt (1:25) obtained at 0.467 mM of Zn(NO3)2.6H2O. It showed the smallest sheet resistance (13.41 ?) which was 38% lower than the ITO sheet resistance (18.44 ?).

The implication of adsorption preferences of ions and surfactants on shape control of gold nanoparticles: a microscopic, atomistic perspective

Shape modulation of nanoparticles is crucial for their tailored applications, however, it depends on surfactants, ions, reactants, and other additives present in the growth solution. Here we dissect the role...

Rapid Hydrothermal Growth of ZnO Nanorods on a Magnetron Sputtered Thick ZnO Seed Layer

In this work, we report rapid hydrothermal growth of ZnO nanorods on a magnetron sputtered thick ZnO seed layer. The ZnO seed layer on the glass substrarte is monocrystalline and formed by 600 °C annealing for 1 hour after magnetic sputtering. The morphology of the ZnO grain in the ZnO seed layer plays a critical role in the growing of the ZnO nanorods, and the slant ZnO grain results in the slant ZnO nanorod and connected ZnO nonrods. It is found that the average growth of the ZnO nanorods is ~75 nm/minute. The rapid grow rate may be owing to the monocrystallie and the pure water solution of the growth solution.

Aplikasi LS sebagai Green Inhibitor Pembentukan Kerak Kalsium Karbonat (CaCO3)

Pemanfaatan inhibitor alami untuk menghambat pembentukan kerak dari materi anorganik telah menjadi kebutuhan masa kini mengingat banyak inhibitor yang digunakan dalam industry tidak ramah lingkungan dan mahal. Pada penelitian ini, inhibitor alami dipelajari dari produk alami yang diberi nama inhibitor LS. Pengujian inhibitor LS dilakukan dengan metode eksperimen seeded pada suhu 90oC dan konsentrasi larutan CaCO3 0.050 M. Hasil menunjukkan bahwa seiring peningkatan konsentrasi inhibitor, semakin efektif juga kemampuan penghambatan terhadap pembentukan kristal CaCO3 yang diiringi dengan penurunan pH larutan. Dapat disimpulkan bahwa penambahan inhibitor LS dengan rentang konsentrasi 50-350 ppm dalam larutan CaCO3 0.050 M, mampu menghambat pembentukan kerat CaCO3 dengan persentase 27,78%. The use of green inhibitors to inhibit scale formation of inorganic materials have become a necessity these days considering the many inhibitors are used in the industry are not environmentally friendly and expensive. In this research, it has been investigated the green inhibitors from natural products called LS Inhibitor. Testing of LS inhibitor was performed by seeded experiment method at temperature of 90 ° C and concentration of CaCO3 growth solution of 0.050 M. The results showed that The higher the inhibitor concentration added the greater the effectiveness of the inhibitor in inhibiting the formation of CaCO3 crystals accompanied by the decrease in pH of the solution. It is concluded that the addition of LS inhibitor in the concentration range of 50-350 ppm in CaCO3 crystal growth solution at the concentration of 0.050 M is able to inhibit the scale formation of CaCO3 around 27-278 %.

Site-specific Ag coating on concave Au nanoarrows by controlling the surfactant concentration

Three distinct site-specific Ag-coated Au nanoarrows are achieved by simply controlling the CTAC concentration of growth solution and analyzed with electron microscopy as well as elemental mapping. The CTAC concentration-dependent, facet-specific passivation represents a new strategy to design particle morphology as well as composition.