2009
DOI: 10.1021/ja805655b
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Plasmonic Cu2−xS Nanocrystals: Optical and Structural Properties of Copper-Deficient Copper(I) Sulfides

Abstract: Cu(2-x)S (x = 1, 0.2, 0.03) nanocrystals were synthesized with three different chemical methods: sonoelectrochemical, hydrothermal, and solventless thermolysis methods in order to compare their common optical and structural properties. The compositions of the Cu(2-x)S nanocrystals were varied from CuS (covellite) to Cu(1.97)S (djurleite) through adjusting the reduction potential in the sonoelectrochemical method, adjusting the pH value in the hydrothermal method and by choosing different precursor pretreatment… Show more

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Cited by 968 publications
(963 citation statements)
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“…[8,9] Others have shown similar LSPRs in nanocrystals of copper(I) selenide and copper(I) telluride. [10][11][12][13][14][15][16] LSPR tunability by variation of the copper vacancy concentration has also been demonstrated by the Alivisatos and Manna groups: the greater the vacancy concentration, the higher the LSPR frequency.…”
mentioning
confidence: 92%
“…[8,9] Others have shown similar LSPRs in nanocrystals of copper(I) selenide and copper(I) telluride. [10][11][12][13][14][15][16] LSPR tunability by variation of the copper vacancy concentration has also been demonstrated by the Alivisatos and Manna groups: the greater the vacancy concentration, the higher the LSPR frequency.…”
mentioning
confidence: 92%
“…An example is the cuprous selenide (Cu 2 Se) nanoparticles, which are easily oxidized into non-stoichiometric Cu 1.8 Se, and become into surprisingly good p-type semiconductor with over 3000 times of enhancements in electrical conductivity. [2] In order to tune the properties of nano-scale copper selenides, a number of techniques and strategies, such as hydro-or solvo-thermal approach, [2,15,16] sonochemistry, [17] electrochemical-deposition, [18] microwave-assistant route, [19] ball milling technique, [6] and chemical welding method, [5] have been developed to prepare nanocrystals, [20] nanotubes/wires, [15,[21][22][23] nanocages, [24] dendrimers, [16,25] and nanosheets [26] with well-defined size, morphology, crystal structure, and composition.…”
Section: Introductionmentioning
confidence: 99%
“…18 This is due to the collective excitation of a large number of free carriers (holes) when the stoichiometry of copper is below 2 (that is, when ''x'' in Cu 2Àx S, Cu 2Àx Se or Cu 2Àx Te is greater than zero). 2,[19][20][21][22] Also, it was found that the position and shape of the plasmon resonance peak in these NCs can be tuned by varying the degree of copper deficiency in the lattice (i.e. ''x'') by means of reversible oxidation/reduction processes.…”
Section: Introductionmentioning
confidence: 99%