Syntheses of Photoluminescent Noble Metal and Carbon Nanomaterials and Their Applications
Date Issued
2015
Date
2015
Author(s)
Chen, Po-Cheng
Abstract
Photoluminescent nanomaterials exhibit great potential for sensing, imaging and visual display because they have advantages of high selectivity and sensitivity, and outstanding photostability. In comparison with conventional semiconductor quantum dots, which use heavy metal ions as precursors, we have developed a series of green approaches for preparation of photoluminescent noble metal and carbon nanomaterials. As-prepared photoluminescent nanomaterials were applied in various fields such as detection of important ions in environmental samples, fabrication of photoluminescent thin films and as catalysts. This dissertation is structured in seven chapters. In Chapter 1, the background of noble metal nanoclusters (NCs) and C-dots including their synthetic routes, optical properties and applications is reviewed in detail. In Chapter 2, alumina nanoparticle supported Au NCs with tunable emission wavelengths were prepared to simplify the purification process. Purified Al2O3 NPs@Au NCs revealed six-fold better sensitivity (from limit of detection (LOD) 10 nM to 1.5 nM) towards silver ions. In Chapter 3, luminescent Cu NC aggregates were prepared in the presence of organic solvent. The relation between aggregation-induced emission behavior and organic solvent was investigated. As-prepared Cu NC aggregates were utilized to detect hydrogen sulfide (LOD: 500 nM), and their practicality was validated by detection of hydrogen sulfide in hot spring water samples. In Chapter 4, a one-pot approach to synthesize bimetallic AuCu NCs was developed. The AuCu NCs revealed interesting pH-dependent photoluminescent behavior, and exhibited their potential as pH sensors and organic dye reduction catalysts. In Chapter 5, a facile method to prepare bovine serum albumin gold nanoclusters (BSA-Au NCs) is reported. The growth mechanism of BSA-Au NCs was studied by mass spectroscopy and photoluminescence measurements. The work laid solid foundation for synthesis of dual-emission metal NCs. In Chapter 6, organosilane-functionalized carbon nanodots (SiC-dots) were synthesized by a simple one-pot hydrothermal route. The photoluminescence of SiC-dots revealed reversible temperature response (293–343 K). Through Si–O–Si bonding, temperature-sensitive photoluminescent SiC-dot films could be easily fabricated on glass substrates without aggregation. In Chapter 7, SiC-dots/SiO2 nanocomposites were prepared from SiC-dots (in Chapter 6). By controlling the heat treatment time, blue, green, and tan (yellow-brown) photoluminescent SiC-dots/SiO2 nanocomposites were achieved. The potential applications for colourful windows, electrocatalysis and lithographic patterning of SiC-dots/SiO2 nanocomposites were demonstrated.
Subjects
gold nanoclusters (Au NCs)
copper nanoclusters (Cu NCs)
gold and copper nanoclusters (AuCu NCs)
silver ions (Ag+)
mercury ions (Hg2+)
hydgrogen sulfide (H2S)
organosilae-functionalized carbon nanodots (SiC-dots)
temperature sensitive
SiC-dots/SiO2 nanocomposites
Type
thesis
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