Although the physico-chemical properties of metal-semiconductor hybrid nanostructures are strongly dependent on their size, shape, composition, and spatial distribution of each component, the find out of new synthetic routes for these hybrid nanostructures has become increasingly important. Several attempts has been devoted in order to obtain different architectures from metal-semiconductor nanocomposites, especially Au-CdSe heterostructure.1-16 In case of nobel metal nanoparticles (NPs) tipped semiconductor quantum rods; Liang et al.1 represents a facile method for synthesis of Au-AgCdSe hybrid nanorods (NRs) through the deposition of silver (Ag) tips at the ends of Au NRs as a seed solution, followed by selenization of the silver (Ag) tips, and overgrowth of CdSe on these sites.1 This is method has been carried out by controlling the pH value.1 Das et al.2 demonstrate a method to fabricate Au decorated CdSe nanowires (NWs) based on the wet chemical method 3-5 to be employed as surface enhanced Raman spectroscopy (SERS) substrates.2 In this synthetic route, the Au NPs prefer to nucleate on lattice defects at the lateral facets of the CdSe NWs, which have a great effect to obtain a homogeneous distribution of Au NPs on the nanowire.2,5 Bala et al.6 demonstrated an effective procedure based on phase transfer between the aqueous and organic media in order to form Au tips on cadmium chalcogenide NPs and NRs. This phase transfer process can be achieved in presence of organic ligand which act as phase transfer and reducing agent for Au3+ ions.6 Salant et al.7 modified a hybrid metal-tipped semiconductor nanorods system known as nano-dumbbells, and used the gold tips as an anchor points for self-assembly using simple thiol molecules.7 I... ... middle of paper ... ... 15, 1047-1056. 11. Pena D J et al. Template Growth of Photoconductive Metal-CdSe-Metal Nanowires. J. Phys. Chem. B 2002, 106, 7458-7462 12. Guardia P. et al. Plasmon Dynamics in Colloidal Au2Cd Alloy–CdSe Core/Shell Nanocrystals. ACS Nano, 2013, 7 (2), pp 1045–1053 13. Lu et al. Synthesis of Core/Shell Nanoparticles of Au/CdSe via Au-Cd Bialloy Precursor. Langmuir 2005, 21, 3684-3687 14. Haldar et al. Hybrid Colloidal Au-CdSe Pentapod Heterostructures Synthesis and Their Photocatalytic Properties. Appl. Mater. Interfaces 2012, 4, 6266-6272 15. AbouZeid K. M., Mohamed M B, and El-Shall M S. Hybrid Au–CdSe and Ag–CdSe Nanoflowers and Core–Shell Nanocrystals via One-Pot Heterogeneous Nucleation and Growth. Small (2011) 7 (23), 3299–3307 16. Figuerola A. et al. Epitaxial CdSe-Au Nanocrystal Heterostructures by Thermal Annealing. Nano Lett., 2010, 10 (8), pp 3028–3036
Chemical Vapor Deposition is the most popular method for producing CNTs the process involved high temperature, hydrocarbon source such as methane which is decomposed in the presence of a metal catalyst (Ando, 2004). There are various types of Chemical Vapor deposition processes, but this method is recognized as Catalytic Chemical Vapor Deposition which is comparatively less expensive to Laser Ablation and Arc discharge methods (Ando, 2004). Chemical Vapor deposition is a flexible and lean way to produce Carbon Nano-tubes. It is very versatile process in which source hydrocarbon can be supplied in any form (Solid, Liquid or gas) and we can use substrates such as Ceramic bricks, cement, glass wool etc. The growth of C...
The oxide of aluminum is amphoteric—showing both acidic and basic properties. The most important compounds include the oxide, hydroxide, sulfate, and mixed sulfate compounds. Anhydrous aluminum chloride is important in the oil and synthetic-chemical industries. Many gemstones—ruby and sapphire, for example—consist mainly of crystalline aluminum oxide.
In basic research, special model systems are needed for quantitative investigations of the relevant and fundamental processes in thin film materials science. In particular, these model systems enable the investigation of i.e. nucleation and growth processes, solid state reactions, the thermal and mechanical stability of thin film systems and phase boundaries. Results of combined experimental and theoretical investigations are a prerequisite for the development of new thin film systems and tailoring of their microstructure and performance.
Alloys in the ornament manufacturing are a general use of gold. Because of it is...
Thus, wavelength of photoelectric threshold of the metal should be longer than 400 nm. However the metals used, zinc and copper, have photoelectric thresholds of 290 nm and 270 nm respectively. Thus the photoelectric effect did not occur during the experiment.
Neidig, H. A., and J. N. Spencer. "Precipitating Lead Chromate on a Small Scale." General Chemistry For Engineering And Science. Mason: Cengage Learning, 2012. 83-90. Print. Signature Lab Ser.
Shyu, Y., Hong, F. (2001). Low-temperature growth and field emission of aligned carbon nanotubes by chemical vapor deposition. Materials Chemistry and Physics, 72, 223-227.
22. Rao, C. emsp14N emsp14R, et al. "Graphene: The New Two‐Dimensional Nanomaterial." Angewandte Chemie International Edition 48.42 (2009): 7752-7777.
Although Solar Energy is a flexible source of where energy could be directly or indirectly converted into forms of energy, it’s still not perfect. With its inefficiency, scientists are trying to find alternative solution to store solar cells for as long as possible. The main process of capturing solar energy happens at the nanoscale. With solar cells, it gets more efficient the tinier it gets. The converting rate of solar energy is equally price competitive as fossil fuel, with a dollar per watt of solar energy. With the help of nanotechnology, it could help raise solar energy conversion efficiency and help lower costs making it the ultimate method of raw energy conversion. To make sure the process of generating energy is kept at a low cost and energy output...
Over the past decades Nanoscience and nanotechnology is a springing up field of research interspersing material science and bionanoscience. Nanotechnology is an expanding area use to deal with materials in nano dimensions. Nanotechnology is the study and application of small object which can be used across all fields such as chemistry, biology, physics, material science and engineering. As the name indicates nano means a billionth or 10-9 unit. Its size range usually from 1-100nm (Nair et al., 2010). Nano size particles are quite unique in nature because nano size increase surface to volume ratio. So the main aim to study its minute size is to trigger chemical activity with distinct crystallography that increases the surface area (Sinha et al., 2009). Thus in recent years much research is going on metallic nanoparticle and its properties like catalyst, sensing to optics, antibacterial activity, data storage capacity and its use in agricultural productivity (Nair et al., 2010 & Sharma et al., 2009).
Grundmann, Marius. Physics of Semiconductors: An Introduction Including Devices and Nanophysics. New York: Springer, 2006. Print.
Plontke, R. (2003, March 13). Chemnitz UT. TU Chemnitz: - Technische Universität Chemnitz. Retrieved April 1, 2014, from http://www.tu-chemnitz.de/en/
[e-book] RAPS Consulting & Nano Energy,prepared for SECCP, Earthlife Africa Johannesburg. Available from: http://projects.gibb.co.za/Portals/3/projects/201002%20Nuclear%201/Appendix%20D%20Public%20Participation/App%20D8/potential%20of%20RE%20in%20SA%20Feb06.pdf [Accessed 7 April 2014]
Silver nanoparticles has been shown huge variations in its property from the macro scale, it’s one of the most studied nanoparticles. The silver nanoparticles has been
In small nano knots the effect of complete dimensionality on electronic edifice has the most philosophical effect on the energies of chief occupied molecular orbital (HOMO) which is valence band and the lowest disused molecular orbital(LUMO),essentially the conveyance band.