國立虎尾科技大學 |

Synthesis of Energy Nanomaterials.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Synthesis of Energy Nanomaterials./
Author:	Xiao, Qiangfeng.
Description:	155 p.
Notes:	Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5446.
Contained By:	Dissertation Abstracts International72-09B.
Subject:	Alternative Energy. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3462872
ISBN:	9781124754727

Synthesis of Energy Nanomaterials.
Xiao, Qiangfeng.

Synthesis of Energy Nanomaterials. - 155 p.

Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5446.

Thesis (Ph.D.)--University of California, Los Angeles, 2010.

Nanomaterials or nanostructured materials are referred to as materials that at least one dimension of structural features is in the range of 1--100 nm. Nanomaterials have revolutionized conventional materials science by modulating the size, structure, morphology, and chemical composition at nanoscale. Their novel properties basically arise from surface effects and quantum effects. They are intensively explored to enhance the performance of devices, such as thermoelectrics, hydrogen storage, fuel cells, photovoltaics, lithium-ion batteries, and so forth. Therefore the synthesis of energy nanomaterials is of particular importance to put them into practical applications. The work in this dissertation is focused on the development of synthesis methodology for different nanostructured energy materials including PbTe, Bi2Te 3, Ni, NixPt3Pd1-x-y (0≤x≤1, 0≤y≤1, 0≤x+y≤1), CdS, CuInS2 and so forth.

ISBN: 9781124754727Subjects--Topical Terms:

845381
Alternative Energy.

Synthesis of Energy Nanomaterials.
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020 $a 9781124754727
035 $a (UMI)AAI3462872
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100 1 $a Xiao, Qiangfeng. $3 845412
245 1 0 $a Synthesis of Energy Nanomaterials.
300 $a 155 p.
500 $a Source: Dissertation Abstracts International, Volume: 72-09, Section: B, page: 5446.
500 $a Adviser: Yunfeng Lu.
502 $a Thesis (Ph.D.)--University of California, Los Angeles, 2010.
520 $a Nanomaterials or nanostructured materials are referred to as materials that at least one dimension of structural features is in the range of 1--100 nm. Nanomaterials have revolutionized conventional materials science by modulating the size, structure, morphology, and chemical composition at nanoscale. Their novel properties basically arise from surface effects and quantum effects. They are intensively explored to enhance the performance of devices, such as thermoelectrics, hydrogen storage, fuel cells, photovoltaics, lithium-ion batteries, and so forth. Therefore the synthesis of energy nanomaterials is of particular importance to put them into practical applications. The work in this dissertation is focused on the development of synthesis methodology for different nanostructured energy materials including PbTe, Bi2Te 3, Ni, NixPt3Pd1-x-y (0≤x≤1, 0≤y≤1, 0≤x+y≤1), CdS, CuInS2 and so forth.
520 $a A general introduction to the colloidal nanocrystals is presented highlighting the current synthesis methods and the assembly of nanocrystals. These methods and processes are performed in liquid phase. Aerosol techniques segment the bulk reactors into spherical microreactors. Aerosol process integrates atomization, evaporation, drying, thermolysis, and sintering into a continuous process. It provides another dimension to manipulate the structure of nanomaterials.
520 $a PbTe are well known thermoelectric materials used at middle temperature range. The synthesis of PbTe nanocrystalline networks using weak capping ligands in aqueous media has been demonstrated. Carbohydrates, including beta-cyclodextrin, D-(+)-glucose, D-glucosamine, lactobionic acid, sucrose, and starch were chosen as weak ligands to facilitate the formation of PbTe nanoparticle networks. The nanoparticle size, ranging from 5 nm to 30 nm, can be tuned by manipulating the temperature and concentration. Through a similar strategy, more complicated nanostructures including carbohydrate spheres PbTe core-shell structures and Te carbohydrate PbTe multilayered submicron cables have been fabricated. This is a general approach which can be easily extended to the fabrication of other semiconductor networks, including PbSe and Bi2Te3 using carbohydrates and ethylenediaminetetraacetic acid (EDTA), respectively, as ligands.
520 $a For practical thermoelectric modules, both n- and p- type semiconductors are needed. We prepared both n- and p- type Bi2Te3 thin films with nanoplates as building blocks. P-type BixSb2-x Te3 (0≤x≤2) thin films were fabricated by substituting antimony for bismuth. Using an excessive amount of Te precursor, n-type Bi 2Te3 thin films were obtained. X-ray diffraction patterns indicate that BixSb2-xTe3 form a ternary solid solution. Scanning tunneling spectroscopy is employed to explore the surface electronic properties of Bi2Te3 thin films. The films exhibit n-type and p-type rectification behavior. The measured band gaps for n-type and p-type films are 1.2 eV and 1.4 eV, respectively. This arises from the quantum confinement effect of nanoplates.
520 $a Based on the accumulated knowledge, we developed a novel strategy to synthesize mesoporous non-oxides by combining the colloidal chemistry and aerosol techniques. Porous materials are commonly used in major industrial processes as sorbents, catalysts, energy conversion and storage materials, and drug delivery vectors. Their performance is generally governed by their porous structure and the framework composition. The current porous materials are mainly constructed from oxide-based frameworks. The developed strategy can be used to synthesize mesoporous particles of metals, alloys and chalcogenide semiconductors. Electron tomograghy demonstrate such materials are assembled from primary nanoparticles into three-dimensional (3D) networks. Such high-surface-area mesoporous particles are of great interest for catalysis, hydrogen storage, and other applications.
520 $a Finally, the mesoprous structure can be tunned into hollow structures by the increase of precursor activity. This general methodology can be used to synthesize hollow spheres of CdS, CdSe, In2S3, PbTe, CdxZn1--xS, and CuInS2. By adding colloidal TiO2, and Fe3O4 nanocrystals, multi-component composites with multifunctions can be readily integrated into one particle. As indicated by the PL spectrum, the added TiO2, and Fe3O 4 nanocrystals facilitate the charge separation. Such hollow particles have low density and high surface area, and enable multiple light reflection and scattering, leading to better light utilization.
590 $a School code: 0031.
650 4 $a Alternative Energy. $3 845381
650 4 $a Engineering, Chemical. $3 845413
650 4 $a Nanoscience. $3 632473
690 $a 0363
690 $a 0542
690 $a 0565
710 2 $a University of California, Los Angeles. $3 642037
773 0 $t Dissertation Abstracts International $g 72-09B.
790 1 0 $a Lu, Yunfeng, $e advisor
790 $a 0031
791 $a Ph.D.
792 $a 2010
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3462872