Solution synthesis of high-quality CuInS2 quantum dots as sensitizers for TiO2 photoelectrodes

Li, Tzung-Luen; Teng, Hsisheng

doi:10.1039/b927279h

Cited by 181 publications

(156 citation statements)

References 84 publications

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“…Electronic levels of one acceptor (V Cu ) and two donors (V S , In Cu ) in bulk CIS were marked within band gap of 1.5 eV from the liter- 3) [7,26], the energy shift of 1S(e) level would be more significant than that of 1S(h) level with a size variation. As mentioned earlier, donor and acceptor energy levels might shift with band gap widening, the shift degree for each defect level depending on the depth from CB or VB edges.…”

Section: Resultsmentioning

confidence: 99%

Noninjection, one-pot synthesis of Cu-deficient CuInS2/ZnS core/shell quantum dots and their fluorescent properties

Nam

Song

Yang

2011

Journal of Colloid and Interface Science

140

145

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Section: Resultsmentioning

confidence: 99%

Noninjection, one-pot synthesis of Cu-deficient CuInS2/ZnS core/shell quantum dots and their fluorescent properties

Nam

Song

Yang

2011

Journal of Colloid and Interface Science

140

145

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“…Most photocatalysts are metal-containing inorganic solids for H 2 and/or O 2 evolution from water. [18][19][20][21][22][23][24][25][26][27][28] High temperature calcination of these metal-containing photocatalysts is generally conducted for high crystallinity, 29 but it shrinks the contacting surface area with water. Molecule-like materials with accurate electronic band structure, high surface area, and stability are an alternative to the crystalline solid.…”

Section: Introductionmentioning

confidence: 99%

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Yeh¹,

Teng²

2012

ECS Trans.

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Graphite oxide (GO) photocatalysts were derived from graphite oxidation. Absorption spectroscopy shows the increasing band gap of GO with the oxygen content. Electrochemical analysis along with the Mott-Schottky equation show that the conduction and valence band edge levels of GO from appropriate oxidation are suitable for both the reduction and oxidation of water. The photocatalytic activity of GO specimens with various oxygen contents was measured in methanol and AgNO 3 solutions for H 2 and O 2 evolution, respectively. The H 2 evolution was strong and stable over time whereas the O 2 evolution was negligibly small due to mutual photocatalytic reduction of the GO with upward shift of the valence band edge under illumination. The conduction band edge of GO showed negligibly change with the oxygen content. When NaIO 3 was used as a sacrificial reagent to suppress the mutual reduction mechanism under illumination, strong O 2 evolution was observed over the GO specimens. The present study demonstrates that chemical modification can easily modify the electronic properties of GO for specific photosynthetic applications. IntroductionHydrogen generation from water decomposition under light irradiation has received much attention.1-7 Photolysis of water using semiconducting photocatalyst powders is considered a prospective candidate because of the low cost in instrumentation and high interfacial contact area for reaction. [8][9][10][11][12][13][14][15][16][17] The essential requirements for an effective semiconducting photocatalyst are more negative conduction band edge and more positive valence band edge, to facilitate respectively reduction and oxidation of water. Additionally, the contact area between the catalyst and water should be large enough to execute photochemical reactions at sufficiently high gas-evolution rates. Most photocatalysts are metal-containing inorganic solids for H 2 and/or O 2 evolution from water. [18][19][20][21][22][23][24][25][26][27][28] High temperature calcination of these metal-containing photocatalysts is generally conducted for high crystallinity, 29 but it shrinks the contacting surface area with water. Molecule-like materials with accurate electronic band structure, high surface area, and stability are an alternative to the crystalline solid. [19][20][21]30,31 Graphite oxide (GO) is a polymer-like material made of carbon, oxygen, and hydrogen, having a large exposable surface area after being dispersed in water to molecular scale. 32 We demonstrated that GO can serve as a photocatalyst for H 2 evolution from water. 33 However, the conduction and valence band levels relative to those for water reduction and oxidation are yet to be explored.GO is derived from extensive oxidation of graphite and contains hydrophilic oxygen functional groups on constituting graphene sheets. [34][35][36][37][38][39][40] Therefore, GO easily disperses in aqueous solutions and exfoliates in the manner of wrinkled paper. The electronic properties of GO are related to the composition of oxygen bonding on grap...

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“…Thus, type-I core/shell structures, such as the CIS/ZnS were developed to enhance the stability and quantum yield of CIS QDs. Zinc ethylxanthate and zinc diethyldithiocarbamate have been used for ZnS shell growth on a CIS core, and interestingly, this has led to a blue shift in photoluminescence [28,31]. This phenomenon differs considerably from that of the general type-I core/shell structures, which show a red shift in emissions with an increase in the thickness of the particle shell.…”

Section: Introductionmentioning

confidence: 78%

“…No discernible difference in reflection peak angle was observed, despite a relatively large variation in Cu content. Three distinct reflection peaks with 2θ values of 28.0°, 46.5°, and 54.9° were well indexed along the (112), (220), and (312) planes, respectively, of a known tetragonal chalcopyrite structure of the CuInS2 phase [30,31]. These XRD results are consistent with those in previous studies, in which the XRD patterns of highly off-stoichiometric (Cu/In ratio of 1/2) CIS QDs were the same as those of the stoichiometric QDs (Cu/In ratio of 1/1) [5].…”

Section: Figurementioning

confidence: 95%

Synthesis of CuInS2 quantum dots using polyetheramine as solvent

Shei¹,

Chiang²,

Chang³

2016

Nano Online

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This paper presents a facile solvothermal method of synthesizing copper indium sulfide (CuInS 2) quantum dots (QDs) via a non-coordinated system using polyetheramine as a solvent. The structural and optical properties of the resulting CuInS2 QDs were investigated using composition analysis, absorption spectroscopy, and emission spectroscopy. We employed molar ratios of I, III, and VI group elements to control the structure of CuInS2 QDs. An excess of group VI elements facilitated precipitation, whereas an excess of group I elements resulted in CuInS2 QDs with high photoluminescence quantum yield. The emission wavelength and photoluminescence quantum yield could also be modulated by controlling the composition ratio of Cu and In in the injection stock solution. An increase in the portion of S shifted the emission wavelength of the QDs to a shorter wavelength and increased the photoluminescence quantum yield. Our results demonstrate that the band gap of the CuInS2 QDs is tunable with size as well as the composition of the reactant. The photoluminescence quantum yield of the CuInS2 QDs ranged between 0.7% and 8.8% at 250°C. We also determined some important physical parameters such as the band gaps and energy levels of this system, which are crucial for the application of CuInS2 nanocrystals.

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Solution synthesis of high-quality CuInS2 quantum dots as sensitizers for TiO2 photoelectrodes

Cited by 181 publications

References 84 publications

Noninjection, one-pot synthesis of Cu-deficient CuInS2/ZnS core/shell quantum dots and their fluorescent properties

Noninjection, one-pot synthesis of Cu-deficient CuInS2/ZnS core/shell quantum dots and their fluorescent properties

Graphite Oxide with Different Oxygen Contents as Photocatalysts for Hydrogen and Oxygen Evolution from Water

Synthesis of CuInS2 quantum dots using polyetheramine as solvent

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