Nanotube–nanotube transformation synthesis and electrochemistry of crystalline CuAgSe nanotubes

Fang, Chunxia; Zhang, Shengyi; Zuo, Pengfei; Wei, Wei; Jin, Baokang; Wu, Jieying; Tian, Yupeng

doi:10.1016/j.jcrysgro.2009.02.003

Cited by 10 publications

(9 citation statements)

References 29 publications

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“…Small-scale CuAgSe nanotubes and dendrites can be prepared from Se and Ag 2 Se nanotemplates, respectively. [20][21] Herein, we synthesize surfactant-free CuAgSe nanoparticles from Cu(NO 3 ) 2 , AgNO 3 , and Se precursors via a robust ambient approach (Scheme 1). The whole synthesis process is very simple and effective (within 30 min) with a high yield (over 90%).…”

Section: Introductionmentioning

confidence: 99%

Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

et al. 2014

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Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e., from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) of 0.42 at 323 K. The pellets show further interesting temperature-dependent transition from n-type into p-type in electrical conductivity arising from phase transition (i.e., from the mixture phases into cubic phase), evidenced by the change of the Seebeck coefficient from -28 μV/K into 226 μV/K at 467 K. The ZT value increased with increasing temperature after the phase transition and reached 0.9 at 623 K. The sintered CuAgSe pellets also display excellent stability, and there is no obvious change observed after 5 cycles of consecutive measurements. Our results demonstrate the potential of CuAgSe to simultaneously serve (at different temperatures) as both an n-type and a p-type thermoelectric material.Keywords surfactant, free, thermoelectric, cuagse, nanoparticles, synthesis, reversible, ambient, metallic, n, p, conductivity, transition, scalable Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsHan, C., Sun, Q., Cheng, Z. Xiang., Wang, J. Li., Li, Z., Lu, G. & Dou, S. Xue. (2014 Supporting Information PlaceholderABSTRACT: Surfactant-free CuAgSe nanoparticles were successfully synthesized on a large scale within a short reaction time via a simple environmentally friendly aqueous approach under room temperature. The nanopowders obtained were consolidated into pellets for investigation of their thermoelectric properties between 3 K and 623 K. The pellets show strong metallic characteristics below 60 K and turn into an n-type semiconductor with increasing temperature, accompanied by changes in the crystal structure (i.e. from the pure tetragonal phase into a mixture of tetragonal and orthorhombic phases), the electrical conductivity, the Seebeck coefficient, and the thermal conductivity, which leads to a figure of merit (ZT) of 0.42 at 323 K. The pellets show further interesting temperature-dependent transition from n-type into p-type in electrical conductivity arising from phase transition (i.e. from the mixture phases into cubic phase), evidenced by the change of the Seebeck coefficient from -28 µV/K into 226 µV/K at 467 K. The ZT value increased with increasing temperature after the phase transition and reached 0.9 at 623 K. The sintered CuAgSe pellets also display excellent stability, and there is no obvious change observed after 5 cycles of consecutive measurements. Our r...

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Section: Introductionmentioning

confidence: 99%

Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

et al. 2014

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“…Second, the changes of Gibbs free energy (Δ G ) for the reactions in Equations (1)–(4) are calculated to be −85.7, −55.8, −43.5, and −84.4 kJ mol −1 based on the assumption that the reaction temperature is constant at 298 K and no entropy changes occur during the reaction. The standard Δ f H 0 values at 298 K for Cu 2 Se, CuSe, Ag 2 Se, AgNO 3 , Cu(NO 3 ) 2 , and CuAgSe are −65.3, −41.8, −43.5, −124.4, −302.9, and −96.9 kJ mol −1 , respectively . Third, similar crystal structures of intermediate Ag 2 Se and the CuAgSe product minimize the distortion of the crystal structure.…”

Section: Resultsmentioning

confidence: 93%

“…One‐/two‐dimensional (1D/2D) ternary semiconductor nanotubes (NTs) have been the subject of extensive studies not only because their electronic structures and properties can be engineered over a broad range for diverse applications such as photodetectors, photovoltaics, and electronics, but also because their unique morphology consists of internal tubes and external nanosheets to form a large surface area, which enables them to be good electron transporters and show better performance than that of solid analogues . For example, ternary CuAgSe has high mobility from both Cu + and Ag + ions, and displays better performance than binary Ag 2 Se or Cu 2 Se in electrochemical devices . This material was initially reported in the 1950s, and has been rarely studied owing to difficulties in synthesis, especially for the preparation of nanostructures.…”

Section: Introductionmentioning

confidence: 99%

“…For example, surfactant‐free CuAgSe nanoparticles were prepared on a large scale to show the temperature‐dependent reversible transition of metallic n – p conductivity, and great potential in converting heat into electricity through the Seebeck effect . Both dendritic and tubular CuAgSe were prepared from Ag 2 Se/Ag or Ag 2 Se/Se templates, but it was time consuming and difficult to avoid Ag or Se in the final products. Thus, a facile and efficient method for the synthesis of ternary CuAgSe nanomaterials with well‐defined composition and architecture is desirable.…”

Section: Introductionmentioning

confidence: 99%

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Ambient Synthesis of One‐/Two‐Dimensional CuAgSe Ternary Nanotubes as Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Chen

Bai

et al. 2015

ChemPlusChem

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, S. Xue. (2016). Ambient synthesis of one-/two-dimensional CuAgSe ternary nanotubes as counter electrodes of quantum-dot-sensitized solar cells. ChemPlusChem, 81 (4), 414-420.Ambient synthesis of one-/two-dimensional CuAgSe ternary nanotubes as counter electrodes of quantum-dot-sensitized solar cells Abstract 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. One-/two-dimensional ternary CuAgSe nanotubes (NTs) were successfully prepared from copper selenide (Cu2-xSe) NTs at room temperature within a short reaction time by the facile cation-exchange approach. Cation exchange leads to the transformation of the crystal structure from cubic into orthorhombic and/or tetragonal with good retention of morphology. The exchange reactions are spontaneous owing to large negative changes of the Gibbs free energy. The effects of parameters such as reaction time, precursor source, and precursor ratio on the exchange reaction were investigated. The resultant CuAgSe NTs were explored as counter electrodes (CEs) of quantumdot-sensitized solar cells (QDSSCs) and achieved higher conversion efficiency (η=5.61%) than those of QDSSCs with the gold as the CE (3.32%).

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“…S5). 29 The Cu 2p3/2 state shows the presence of two electronic states located at 932.4 eV and 934 eV. 27 As the difference in the binding energy of Cu 0 and Cu + is very small (only few meV), an Auger analysis was carried out by using the Auger parameter (AP).…”

Section: Resultsmentioning

confidence: 99%

Molecules versus Nanoparticles: Identifying a Reactive Molecular Intermediate in the Synthesis of Ternary Coinage Metal Chalcogenides

et al. 2020

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Identification of reactive intermediates during molecule-to-nanoparticles transformation has a great significance in comprehending the mechanism of nanoparticles formation and, therefore, optimizing the synthetic conditions and properties of the formed products. We report here room temperature synthesis of AgCuSe nanoparticles from the reaction of ditertiarybutyl selenide with trifluoroacetates (TFA) of silver(I) and copper(II). The isolation and characterization of a molecular species during the course of this reaction, [Ag2Cu(TFA)4(t Bu2Se)4] (1), which shows an extraordinary reactivity and interesting thermochromic behavior (blue at 0 °C and green at RT), confirmed that ternary metal selenide NPs are formed via this intermediate species. Similar reactions with related dialkyl chalcogenide R2E resulted in the isolation of molecular species of similar composition [Ag2Cu(TFA)4(R2E)4]

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Nanotube–nanotube transformation synthesis and electrochemistry of crystalline CuAgSe nanotubes

Cited by 10 publications

References 29 publications

Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

Ambient Scalable Synthesis of Surfactant-Free Thermoelectric CuAgSe Nanoparticles with Reversible Metallic-n-p Conductivity Transition

Ambient Synthesis of One‐/Two‐Dimensional CuAgSe Ternary Nanotubes as Counter Electrodes of Quantum‐Dot‐Sensitized Solar Cells

Molecules versus Nanoparticles: Identifying a Reactive Molecular Intermediate in the Synthesis of Ternary Coinage Metal Chalcogenides

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