9 pages/≈2475 words
Chemical Engineering: Characterization of HgS/CdS Core-Shell Nanocomposite Using Photoacoustic (Research Proposal Sample)
Characterization of HgS/CdS Core-Shell Nanocomposite Using Photoacoustic
Nanocomposite materials provide a chance for better functionality as well as multifunctional properties compared to their single-component counterparts that are perceived as more limited. A good example of Nanocomposite material includes inorganic core cell structure where the core and the shell comprise of semiconductors. Besides, there is enhanced photoluminescence through the shell motif, enhanced stability against photochemical oxidation, improved processability amongst engineered band structures. Despite the current modifications and improvements made in the core shell structures, there are still gaps in the characterization of these samples. This study seeks to provide an efficient characterization technique for HdS/CdS core-shell Nanocomposite through Photoacoustic. Besides, these results will be compared with TEM, UV-vis and XRD results with an intent of shedding more light on the solar cell.
HgS/CdS Core-Shell Nanocomposite, Photoacoustic, TEM, XRD, UV-vis, Photoluminescence
In reference to Chaudhuri and Paria (2012), nanomaterials possess various dimensions on the nanometer scale in addition to depicting novel properties from their bulk materials. In this case, the synthesis, characterization as well as the application of nanoparticles provide the basic areas of nanotechnology. Over the past few years, nanoparticles have been in the spotlight as there is increased need to advance from microparticles to nanoparticles. This study will seek to provide a medium to characterize HgS/CdS core-shell Nanocomposite that is vital in enhancing immense changes in the chemical or physical properties of a material.
Background: Core/Multishell Semiconductor Nanoparticles
There are several benefits associated with this class of nanoparticles. Chaudhuri and Paria (2012) state that multilayer semiconductor nanoparticles give higher quantum yield, improved optical properties, photoluminescence, easier detection of the emission spectra since they are shifted toward greater wavelength in the visible range. Besides, these particles also present improved electronic properties as well as better structural properties compared to unlayered CS particles. Wu, Bittner and Kern (2005) define this lattice mismatch as a situation where two materials with varying lattice constants are brought together through depositing one material on top of the other.
Some of the advantages associated with lattice mismatch between the material making up the core and the shell are that the shell grows to significant thickness while conserving its luminescence properties. The rationale for this study follows the influx of interested parties in nanoparticles due to their enormous, exciting applications. In reference to Harrison et al. (2000) when a smaller band gap semiconductor material is embedded between the core and the outer shell of the material with a larger band, such particles are thus defined as QDQW (Quantum Dot Quantum Well).
The selection of core and shell materials is carried out mainly considering the band gap and the lattice structure of the sample used to make the CSS semiconductor particles. In this study, the author will characterize HgS/cdS core-shell Nanocomposite, which is an example of the particles mentioned above. Chaudhuri and Paria (2012) state that the optical or photostability of the multilayered particle is comparable to that of HgS/CdS as a result of the further coating on CdS, which is a high band gap compound. In this case, the quantum yield also escalates. HgS is a low band gap compound, and when sandwiched with a high band gap compound such as CdS, the electrons are consequently confined within the HgS layer as well as forming a quantum well.
Normally, the TEM micrographs fail to show the core as well as shell structure as a result of the similarity in the core and shell materials as well as the nanometer size. In this case, a better characterization technique is required to facilitate proper characterization of these Nanocomposite particles. As of the moment, it is not clear on how core and shell nanoparticles can be documented clearly and characterized adequately. In general, the research on synthesis and characterization of core and shell nanoparticles is in its infancy and as a result, focused studies are called for to ensure better formation methods and better techniques for characterization.
Photoacoustic offers a better channel to characterize HgS/CdS core-shell Nanocomposite amongst other Core/Multishell semiconductor nanoparticles.
• To characterize HdS/CdS core-shell Nanocomposite
• To find out the most efficient method for HdS/CdS characterization between the four methods of sample analysis used in the study.
• To provide a vast background on Multishell semiconductor nanoparticles.
• To analyze previous research studies carried out on this topic in the literature review and point out gaps in current literature.
• To provide a glimpse of the four tools deployed in the methodology for analyzing the sample
• To examine the differences in the particle sizes as indicated by the various analytical methods used.
In reference to Harrison et al. (2000), the resulting hybrid nanocrystals showed a considerable increase in the QE (Quantum Efficiency) over the CdS material. Semiconductors are defined as quantum dots that belong to a state of matter between the molecular material and that of the bulk. Their large surface to volume ration and the quantum confinement effect are behind the unique physical and chemical properties. The quantum confinement effect comes about when the particle size is less than the exciton dimensions. Also, there is the widening of the bandgap as well as a blueshift of the photoluminescence (PL).
Besides, Kim et al. (2004) argue that Nanocomposite materials do provide possibilities for enhanced functionality as well as multifunctional properties. The authors claim that in cases where semiconductors are made of the core and the shell, the core-shell motif allowed enhanced photoluminescence as well as enhanced stability against photochemical oxidation. Harrison et al. (2000) state that some of the variables affecting the Photoluminescence behavior, charge carrier dynamics, non-linear optical properties and phase transi...
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