Dissertation > Excellent graduate degree dissertation topics show

Prepartion of Bi2O3@Bi2S3and CdO@CdS Core-Shell Structured Macro/Nano-Semiconductor Materials and Their Photoelectrochemical Properties

Author: LiuFaAi
Tutor: LiZeLin
School: Hunan Normal University
Course: Physical and chemical
Keywords: semiconductor type-Ⅱ core-shell structure photoelectrochemistry photoresponse oxide sulfide eletrodeposition
CLC: TB383
Type: Master's thesis
Year: 2012
Downloads: 136
Quote: 1
Read: Download Dissertation

Abstract


Macro/nano-scale semiconductor photoelectric materials with core-shell structure have been attracted wide attention due to their unique physical and chemical properties and applications in photoelectrochemical solar cells, optoelectronics, optics, biology and medicine, and so on. The type-Ⅱ core-shell nanostructures have obtained considerable development in recent years as a result of the unique band edge alignment. In this work, we studied the preparation of Bi2O3@Bi2S3and CdO@CdS type-II core-shell semiconductors and their photoelectrochemical properties. The main contents are as follows:(1) Thin films of type-Ⅱ Bi2O3@Bi2S3core-shell nanoparticles (NPs) have been assembled on fluorine doped tin oxide (FTO) coated conducting glass substrates via a facile new route. It contains three steps: electrochemical dispersion of a Bi electrode into Bi NPs collected with the FTO substrate, thermal treatment of the assembled thin film of Bi NPs on FTO into Bi2O3NPs, and then surface sulfurization of the Bi2O3NPs. The Bi2O3@Bi2S3core-shell structure was confirmed by combined analysis of XRD and Raman spectroscopy. The influence of collection time and surface sulfurization time on the photoelectrochemical performance was investigated. The prepared Bi2O3@Bi2S3core-shell film displayed better photoelectrochemical performance and photoresponse than that of respective films of Bi2S3NPs and Bi2O3NPs and the reason was discussed.(2) Dendritic thin films of type-Ⅱ Bi2O3@Bi2S3core-shell semiconductors have been prepared on the FTO through three steps, including electrodepositon of dendritic Bi film, oxidation by thermal treatment and surface sulfurization of the Bi2O3dendrite. The Bi2O3@Bi2S3core-shell structure was confirmed by combined analysis of XRD and XPS. The influence of electrodepositon time and surface sulfurization time on the photoelectrochemical performance was investigated. The prepared type Ⅱ Bi2O3@Bi2S3core-shell film displayed better photoelectrochemical performance than that of respective Bi2S3film and Bi2O3film and the reason was discussed.(3) Thin films of type-Ⅱ CdO@CdS core-shell macro/nanoparticles were obtained on FTO through three steps:electrodepositon of Cd particles, oxidation by thermal treatment and surface sulfurization of the CdO particles. The CdO@CdS core-shell structure was confirmed by combined analysis of XRD and XPS. The influence of electrodepositon time and surface sulfurization time on the photoelectrochemical performance was investigated. The prepared CdO@CdS core-shell film displayed better photoelectrochemical performance than that of respective CdO and CdS films, and the reason was discussed. The photovoltage properties of CdO@CdS core-shell films in defferent electrolytes have also been studied.

Related Dissertations

  1. Technology of Filling Clearance and Optimizing the Bonds during Ultrasonic Brazing,TG454
  2. Under microaerobic conditions closed calcium carbide furnace exhaust COS gas adsorption purification,X781
  3. Design, Synthesis and Antitumor Activities Study of Quinoxaline-1,4-dioxide Derivatives,R914
  4. Of Bi N Co-doped TiO \u003csub\u003e 2 \u003c/ sub\u003e of the preparation and performance,O614.411
  5. Department of Bi-based Co-based oxide thermoelectric ceramics and thin films,TQ174.7
  6. LSGM electrolyte thin films and electrochemical properties of,TM911.4
  7. Synthesis and properties of new functionalized graphene oxide drug carriers,TQ460.4
  8. Recovery Sulphur from Zinc Concentrate of Pressure Acid Leaching Residue,X751
  9. Studies on the Effects of Exogenous Nitric Oxide on Rice under Cadmium Stress,S511
  10. Study on Heat Resistance of Chrysanthemum Floral Organ and Effects of Exogenously Nitric Oxide on Heat Resistance of Chrysanthemum,S682.11
  11. Tissue-engineered Construction and Preliminary Implantation Study of Diamond-like Carbon Films for Artificial Mechanical Valve Applications,R654.2
  12. Kinase Activities Analysis and Localization of ZmCCaMK Induced by Abscisic Acid in Leaves of Maize Plants,S513
  13. The Experimental Study of Semiconductor Laser Radiation and 5-FU Sustained Release Repressed Oral Malignant Tumor Cell,R739.8
  14. Effects of Cold-adaptation Swimming on Hemorheology and Quantity of NO and NOS in Aorta of SD Rats in Acute Cold Water Stress,R87
  15. Preparation and Photocatalytic Properties of Semiconductor Oxides,O643.36
  16. A Study on Corporation Lean Production Model,F273
  17. Study on the All-Optical Clock Recovery Based on Fiber Ring Laser,TN929.11
  18. Semiconductor Corporate Strategy Solution Under Low Carbon Economic,F205
  19. Pyridine C-H Bond Activation and Functionalizatin,O621.25
  20. The Advantage and Process Optimization for Copper Wire Bond,TN305.94
  21. Study on the Effects of Space Charges in Organic Optoelectronic Devices,TN36

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials
© 2012 www.DissertationTopic.Net  Mobile