| LDR | | 00000nam u2200205 4500 |
| 001 | | 000000435805 |
| 005 | | 20200228105537 |
| 008 | | 200131s2019 ||||||||||||||||| ||eng d |
| 020 | |
▼a 9781088322659 |
| 035 | |
▼a (MiAaPQ)AAI13904282 |
| 040 | |
▼a MiAaPQ
▼c MiAaPQ
▼d 247004 |
| 082 | 0 |
▼a 574 |
| 100 | 1 |
▼a Hall, Leah Margaret Graham. |
| 245 | 10 |
▼a (Ga1-xZnx)(N1-xOx) Nanocrystals: Photochemical H2 Production and Spatial Characterization of Electronic Structure. |
| 260 | |
▼a [S.l.]:
▼b University of Colorado at Boulder.,
▼c 2019. |
| 260 | 1 |
▼a Ann Arbor:
▼b ProQuest Dissertations & Theses,
▼c 2019. |
| 300 | |
▼a 131 p. |
| 500 | |
▼a Source: Dissertations Abstracts International, Volume: 81-04, Section: B. |
| 500 | |
▼a Advisor: Dukovic, Gordana. |
| 502 | 1 |
▼a Thesis (Ph.D.)--University of Colorado at Boulder, 2019. |
| 506 | |
▼a This item must not be sold to any third party vendors. |
| 520 | |
▼a Solar fuel generation via artificial photosynthesis is a promising pathway to a clean and sustainable source of energy. Nanoscale (Ga1-xZnx)(N1-xOx) has been synthesized in the solid state in order to answer the call for new multinary semiconductors for use in solar fuel generation. Herein, the solid-state mechanism of (Ga1-xZnx)(N1-xOx) nanocrystal formation involving phase transformation of cubic spinel ZnGa2O4 to wurtzite (Ga1-xZnx)(N1-xOx) and diffusion of the elements combined with nitrogen incorporation will be discussed. Understanding how multinary semiconductor compounds function and drive multi-electron photochemical reactions is of the utmost importance for potentially using them in solar applications. One goal is to utilize (Ga1-xZnx)(N1-xOx) nanocrystals for solar photochemistry and understand why their efficiencies have been historically low. The use of (Ga1-xZnx)(N1-xOx) nanocrystals for photochemical H2 generation in an aqueous system with a redox mediator will be discussed. The four-part H2 generation system uses (Ga1-xZnx)(N1-xOx) nanocrystals as a light absorber, methyl viologen as an electron relay, Pt nanoparticles as a cocatalyst, and dithioerythritol as a sacrificial hole scavenger. Each charge-transfer step is studied in isolation in order to evaluate the factors that determine the overall photochemical efficiency. It is concluded that electron transfer from(Ga1-xZnx)(N1-xOx) to MV2+ is likely the most limiting step for the overall system. To date, little analysis has been done on the electronic structure of (Ga1-xZnx)(N1-xOx), particularly for samples with different elemental distributions. How the electronic structure changes when comparing homogeneous and heterogeneous (Ga1-xZnx)(N1-xOx) nanocrystals and how the electronic structure changes spatially throughout a single particle will be investigated. It is found that the heterogeneous (Ga1-xZnx)(N1-xOx) nanocrystals show two energy transitions, one in the UV region and one in the visible region, while the homogeneous particles only show a visible transition. Additionally, the shape of the energy loss spectrum stays constant throughout a particle indicating that the electronic structure is constant in a single particle. |
| 590 | |
▼a School code: 0051. |
| 650 | 4 |
▼a Chemistry. |
| 650 | 4 |
▼a Nanoscience. |
| 650 | 4 |
▼a Materials science. |
| 650 | 4 |
▼a Biochemistry. |
| 690 | |
▼a 0485 |
| 690 | |
▼a 0794 |
| 690 | |
▼a 0565 |
| 690 | |
▼a 0487 |
| 710 | 20 |
▼a University of Colorado at Boulder.
▼b Chemistry. |
| 773 | 0 |
▼t Dissertations Abstracts International
▼g 81-04B. |
| 773 | |
▼t Dissertation Abstract International |
| 790 | |
▼a 0051 |
| 791 | |
▼a Ph.D. |
| 792 | |
▼a 2019 |
| 793 | |
▼a English |
| 856 | 40 |
▼u http://www.riss.kr/pdu/ddodLink.do?id=T15492530
▼n KERIS
▼z 이 자료의 원문은 한국교육학술정보원에서 제공합니다. |
| 980 | |
▼a 202002
▼f 2020 |
| 990 | |
▼a ***1008102 |
| 991 | |
▼a E-BOOK |