Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics

Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics

Bibliographic Details
Main Author: Jiang, Zhoufeng, Jiang
Language:English
Published: Bowling Green State University / OhioLINK 2018
Subjects:
Chemistry
Nanoscience
Nanotechnology
Materials Science
Physics
semiconductor nanocrystals
nanosheets
emission
lead sulfide
absorption
cation exchange
carbon nanodots
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522964027555741
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-bgsu15229640275557412021-08-03T07:05:52Z Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics Jiang, Zhoufeng, Jiang Chemistry Nanoscience Nanotechnology Materials Science Physics semiconductor nanocrystals nanosheets emission lead sulfide absorption cation exchange carbon nanodots Two-dimensional oriented attachment has been confirmed as the growth mechanism of PbS nanosheets by Horst Weller in 2010. By interrupting the growth of PbS nanosheets, we investigated the intermediate PbS products which include isolated PbS quantum dots, attached PbS quantum dots and porous PbS nanosheets. We linked the intermediate PbS products with their structure and optical properties by comparing the emissions from PbS quantum dots and emissions from PbS nanosheets. Meanwhile, we shield PbS nanosheets with a shell of CdS by cation exchange to improve their optical properties and tune their bandgaps. Furthermore, we found that PbS nanosheets can be completely converted into CdS nanosheets by cation exchange, while keeping the same morphology. Thus, we can compare their photophysics properties when they have the same quantum confinement dimensions. On the other hand, carbon nanodots have become a very promising nanomaterial for numerous bio-and optoelectronic applications since they have superior chemical stability and low toxicity compared to conventional inorganic semiconductor quantum dots. We investigated the origin of photoluminescence(PL) on citric-acid-derived carbon nanodots, particularly focusing on the excitation-dependent PL behavior. By conducting the absorption, PL and PL-excitation spectra, we succeed to observe the multi-emissive states of carbon nanodots. 2018-04-23 English text Bowling Green State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522964027555741 http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522964027555741 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Chemistry
Nanoscience
Nanotechnology
Materials Science
Physics
semiconductor nanocrystals
nanosheets
emission
lead sulfide
absorption
cation exchange
carbon nanodots
spellingShingle Chemistry
Nanoscience
Nanotechnology
Materials Science
Physics
semiconductor nanocrystals
nanosheets
emission
lead sulfide
absorption
cation exchange
carbon nanodots
Jiang, Zhoufeng, Jiang
Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
author Jiang, Zhoufeng, Jiang
author_facet Jiang, Zhoufeng, Jiang
author_sort Jiang, Zhoufeng, Jiang
title Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
title_short Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
title_full Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
title_fullStr Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
title_full_unstemmed Zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
title_sort zero-dimensional and two-dimensional colloidal nanomaterials and their photophysics
publisher Bowling Green State University / OhioLINK
publishDate 2018
url http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1522964027555741
work_keys_str_mv AT jiangzhoufengjiang zerodimensionalandtwodimensionalcolloidalnanomaterialsandtheirphotophysics
_version_ 1719453531299119104

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