Fabrication and characterization of size-controlled CuTCNQ charge-transfer complex nanocrystals

Hiraishi, Kentaro; Masuhara, Akito; Yokoyama, T.; Kasai, Hitoshi; Nakanishi, Hachiro; Oikawa, Hidetoshi

doi:10.1016/j.jcrysgro.2008.09.158

Cited by 20 publications

(16 citation statements)

References 52 publications

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“…As well the C=C−H bending shifts from 858 to 822 cm −1 . The Raman shift from 1450 to 1380 cm −1 due to charge transfer verifies that TCNQ has been reduced to TCNQ − , consistent with the literatures …”

Section: Resultssupporting

confidence: 91%

“…After that, Cu‐TCNQ/Cu was characterized with XRD. The XRD peaks of Cu‐TCNQ/Cu match perfectly with the patterns reported in previous literatures, revealing that Cu‐TCNQ crystals with phase I structure were obtained (Figure a).…”

Section: Resultssupporting

confidence: 88%

“…As well the C=CÀHb ending shifts from 858 to 822 cm À1 .T he Raman shift from 1450 to 1380 cm À1 due to charget ransferv erifies that TCNQ has been reduced to TCNQ À ,c onsistent with the literatures. [31,32] The conductivity of the as-prepared Cu-TCNQ film on Cu foil was tested by four-point probe. The average electrical conductivity of Cu-TCNQ film is 0.305 Scm À1 ,w hich confirms that Cu-TCNQ with phase Is tructure exhibits ah igh electricalc onductivity.…”

Section: Resultsmentioning

confidence: 99%

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Multiple Active Sites: Lithium Storage Mechanism of Cu‐TCNQ as an Anode Material for Lithium‐Ion Batteries

Meng

Chen

Fang

et al. 2019

Chemistry An Asian Journal

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Recently, carboxylate metal‐organic framework (MOF) materials were reported to perform well as anode materials for lithium‐ion batteries (LIBs); however, the presumed lithium storage mechanism of MOFs is controversial. To gain insight into the mechanism of MOFs as anode materials for LIBs, a self‐supported Cu‐TCNQ (TCNQ: 7,7,8,8‐tetracyanoquinodimethane) film was fabricated via an in situ redox routine, and directly used as electrode for LIBs. The first discharge and charge specific capacities of the self‐supported Cu‐TCNQ electrode are 373.4 and 219.4 mAh g−1, respectively. After 500 cycles, the reversible specific capacity of Cu‐TCNQ reaches 280.9 mAh g−1 at a current density of 100 mA g−1. Mutually validated data reveal that the high capacity is ascribed to the multiple‐electron redox conversion of both metal ions and ligands, as well as the reversible insertion and desertion of Li+ ions into the benzene rings of ligands. This work raises the expectation for MOFs as electrode materials of LIBs by utilizing multiple active sites and provides new clues for designing improved electrode materials for LIBs.

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Section: Resultssupporting

confidence: 91%

Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Multiple Active Sites: Lithium Storage Mechanism of Cu‐TCNQ as an Anode Material for Lithium‐Ion Batteries

Meng

Chen

Fang

et al. 2019

Chemistry An Asian Journal

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“…Several reaction times (10,20,30 or 40 s) were tested to optimize conditions for the CuTCNQ growth process and to apprehend via hole filling. Once again, the formation of CuTCNQ complex was checked by Raman spectroscopy: the measured spectrum was very similar to the one obtained on CuTCNQ nanocrystals [27] crystallizing in phase I [28]. Moreover, selected area electron diffraction (SAED) patterns attested the crystalline nature of CuTCNQ complex [29].…”

Section: Solution Growth Of Cutcnq Complexmentioning

confidence: 76%

Solution growth of metal-organic complex CuTCNQ in small dimension interconnect structures

Demolliens

Müller

et al. 2010

Journal of Crystal Growth

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“…All of the Cu-TCNQ NCs are assigned to phase I, which has an ordered column structure of TCNQ, from powder XRD measurements as previously reported. 26) Such an NC structure is expected to exhibit electric conduction due to the band structure induced byinteractions. In particular, phase I Cu-TCNQ shows the switching behavior induced by the change in electronic structure.…”

Section: Structure Of Cu-tcnq Ncsmentioning

confidence: 99%

Optical and Electrical Properties of Size-Controlled Cu–7,7',8,8'-Tetracyanoquinodimethane Nanocrystals

Hiraishi

Masuhara

Kasai

et al. 2010

Jpn. J. Appl. Phys.

Self Cite

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We report the optical and electrical properties of Cu-TCNQ (TCNQ = 7,7 0 ,8,8 0 -tetracyanoquinodimethane) nanocrystals (NCs) fabricated by previously reported chemical reduction reprecipitation methods. The size of the resulting NCs ranges from 50 nm to 10 mm along the long axis. Raman experiment, X-ray photoelectron spectroscopic experiment, and elemental analysis reveal that these NCs have few TCNQ dianions due to the excess amount of Cu. The absorption of interband transition in the near-infrared region shows a blue shift, and the band gap increases with decreasing NC size. The obtained NCs show high electric conductivity, compared with typical Cu-TCNQ microcrystals, and multistep switching due to the existence of TCNQ dianions. #

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Fabrication and characterization of size-controlled CuTCNQ charge-transfer complex nanocrystals

Cited by 20 publications

References 52 publications

Multiple Active Sites: Lithium Storage Mechanism of Cu‐TCNQ as an Anode Material for Lithium‐Ion Batteries

Multiple Active Sites: Lithium Storage Mechanism of Cu‐TCNQ as an Anode Material for Lithium‐Ion Batteries

Solution growth of metal-organic complex CuTCNQ in small dimension interconnect structures

Optical and Electrical Properties of Size-Controlled Cu–7,7',8,8'-Tetracyanoquinodimethane Nanocrystals

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