Copper Tetracyanoquinodimethane: From Micro/Nanostructures to Applications

Zheng, Yingshuang; Li, Jie; Ji, Deyang; Dong, Huanli; Li, Liqiang; Fuchs, Harald; Hu, Wenping

doi:10.1002/smll.202004143

Cited by 14 publications

(9 citation statements)

References 139 publications

(237 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand, the width of the rod was gradually reduced when the reaction time was increased from 10 to 15 min, as shown in Figure e, f. Noteworthily, CuTCNQ-10 microrods transformed to CuTCNQ-15 microtubes with a hollow structure, and the surface of the microtubes became rougher. This phenomenon is mainly attributed to the phase change of TCNQ molecules from phase I (in one direction) to phase II (in two perpendicular planes) …”

Section: Resultsmentioning

confidence: 99%

“…This phenomenon is mainly attributed to the phase change of TCNQ molecules from phase I (in one direction) to phase II (in two perpendicular planes). 16 A transmission electron microscopy (TEM) image of an individual cracked-open CuTCNQ-15 microtube is shown in Figure 1g, suggesting a width of 400 nm. In addition, the porous morphology of the CuTCNQ-15 microtubes observed in Figure 1h is beneficial for functionalization with other materials.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs₃Cu₂I₅/CuTCNQ Hierarchical Heterostructure

Zhi

Liu

Zou

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

With the rapid advances in metal halide perovskite optoelectronics, eliminating toxic lead from perovskites has been an urgent demand. However, state-of-the-art lead-free perovskite photodetectors are still challenged with issues of low photoresponse, poor stability, etc. Here, all-inorganic lead-free perovskite (Cs 3 Cu 2 I 5 ) single crystals that possess good stability under air exposure are synthesized via a facile solid reaction method. Meanwhile, a higher photoluminescence quantum yield of 95.2% and a prolonged carrier lifetime of 1.127 μs are obtained by further optimizing the synthesis. Benefiting from the polyporous surface and hollow structure of Cu-7,7,8,8-tetracyanoquinodimethane (CuTCNQ) microtubes, more Cs 3 Cu 2 I 5 nanocrystals can adhere on the innershell and outershell of CuTCNQ-15 microtubes. This unique structure contributes to the improved efficiency of utilizing incident light and promotes charge carrier generation and transportation. As a result, the hierarchical CuTCNQ/Cs 3 Cu 2 I 5 (hollow microtube/nanocrystal) heterostructure phototransistor exhibits a high responsivity of 88.36 A W −1 and a large detectivity of 1.66 × 10 12 Jones. The proposed lead-free perovskites and mixed-dimensional heterojunctions are promising for sensitive light detection.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs₃Cu₂I₅/CuTCNQ Hierarchical Heterostructure

Zhi

Liu

Zou

et al. 2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

show abstract

“…The optimized structure of Ge-TCNQ is prototypical as most reported metal-TCNQ, analogous to Ag-TCNQ and Cu-TCNQ. [33,34] The Ge-TCNQ structure exhibits planar structure and each Ge atom coordinates with four nitrogen atoms from TCNQ molecules, forming the Ge-TCNQ network. A TCNQ molecule can accept electrons from adjacent Ge atoms to generate TCNQ − radical.…”

Section: Resultsmentioning

confidence: 99%

2D Metal‐Organic Complex Luminescent Crystals

Pei

Zhao

et al. 2021

Adv Funct Materials

View full text Add to dashboard Cite

2D emissive crystals have attracted tremendous research interests due to their outstanding compatibility with an integrated planar photonic system, which ideally meet the requirement for versatile photonic device applications, such as lasers, light-emitting devices, and optical waveguides. Among 2D emissive materials, metal-organic complex crystals are highly desirable because of their strong charge-transfer interactions and enhanced optical absorption that benefit superior luminescence efficiency. Here, the in-air sublimation method is adopted to synthesize 2D Ge-TCNQ microplate crystals (TCNQ, 7,7,8,8-tetracyanoquinodimethane) with thickness down to 13.4 nm. Such ultrathin Ge-TCNQ crystals exhibit an exciton binding energy of 40.7 meV and a decent photoluminescence (PL) quantum efficiency of 5.53%. The fitting slope of excitation power-dependent PL intensity displays a transition from linear to superlinear characteristics that reveals both trap-assisted recombination and free carrier recombination are present in the luminescence process. The energy band structure of Ge-TCNQ is examined by ultraviolet photoelectron spectroscopy and UV-vis spectroscopy to elucidate the physical mechanism of photo excitation and fluorescence processes. The emissive Ge-TCNQ crystals are further employed as high-performance optical waveguides with a small optical loss coefficient of 0.078 dB µm −1 . This work opens new avenues using 2D metal-organic complex crystals to develop advanced optoelectronic devices.

show abstract

“…[29][30][31] CuTCNQ, a well-known chargetransfer MOF, consisting of cuprous ion and a tetracyano-substituted quinoid ligand, has shown potential applications in energy storage, field emission, and organic transistor devices. [29,[32][33][34] Profitted by the strong inductive effect from the cyano groups, CuTCNQ was deemed as the state-of-the-art organic electrode materials for monovalent ion (Li + , Na +, and K + ) batteries and exhibited excellent performance in terms of average potential and capacity. [29,30,35] Unfortunately, the electrochemical behavior of CuTCNQ for multivalent-ion batteries has not been reported, and the electrochemical behavior is still unclear.…”

Section: Introductionmentioning

confidence: 99%

Cation‐Anion Redox Active Organic Complex for High Performance Aqueous Zinc Ion Battery

Zhang

Jiang

Chen

et al. 2023

Energy & Environ Materials

View full text Add to dashboard Cite

Organic redox compounds are attractive cathode materials in aqueous zinc‐ion batteries owing to their low cost, environmental friendliness, multiple‐electron‐transfer reactions, and resource sustainability. However, the realized energy density is constrained by the limited capacity and low voltage. Herein, copper‐tetracyanoquinodimethane (CuTCNQ), an organic charge–transfer complex is evaluated as a zinc‐ion battery cathode owing to the good electron acceptation ability in the cyano groups that improves the voltage output. Through electrochemical activation, electrolyte optimization, and adoption of graphene‐based separator, CuTCNQ‐based aqueous zinc‐ion batteries deliver much improved rate performance and cycling stability with anti‐self‐discharge properties. The structural evolution of CuTCNQ during discharge/charge are investigated by ex situ Fourier transform infra‐red (FT‐IR) spectra, ex situ X‐ray photoelectron spectroscopy (XPS), and in situ ultraviolet visible spectroscopy (UV–vis), revealing reversible redox reactions in both cuprous cations (Cu+) and organic anions (TCNQx‐1), thus delivering a high voltage output of 1.0 V and excellent discharge capacity of 158 mAh g−1. The remarkable electrochemical performance in Zn//CuTCNQ is ascribed to the strong inductive effect of cyano groups in CuTCNQ that elevated the voltage output and the graphene‐modified separator that inhibited CuTCNQ dissolution and shuttle effect in aqueous electrolytes.

show abstract

Copper Tetracyanoquinodimethane: From Micro/Nanostructures to Applications

Cited by 14 publications

References 139 publications

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs₃Cu₂I₅/CuTCNQ Hierarchical Heterostructure

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs₃Cu₂I₅/CuTCNQ Hierarchical Heterostructure

2D Metal‐Organic Complex Luminescent Crystals

Cation‐Anion Redox Active Organic Complex for High Performance Aqueous Zinc Ion Battery

Contact Info

Product

Resources

About

Copper Tetracyanoquinodimethane: From Micro/Nanostructures to Applications

Cited by 14 publications

References 139 publications

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs3Cu2I5/CuTCNQ Hierarchical Heterostructure

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs3Cu2I5/CuTCNQ Hierarchical Heterostructure

2D Metal‐Organic Complex Luminescent Crystals

Cation‐Anion Redox Active Organic Complex for High Performance Aqueous Zinc Ion Battery

Contact Info

Product

Resources

About

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs₃Cu₂I₅/CuTCNQ Hierarchical Heterostructure

Near-UV Phototransistors Based on an All-Inorganic Lead-Free Cs₃Cu₂I₅/CuTCNQ Hierarchical Heterostructure