Direct Layer-by-Layer Growth of Crystalline Ag-TCNQ Thin Films on Functionalized Au Substrate: How Critical Is the pH of Ag(I) Solution?

Lathika, Aswani Sathish; Rana, Shammi; Prasoon, Anupam; Sindhu, Pooja; Roy, Debashree; Ballav, Nirmalya

doi:10.1021/acs.jpclett.0c03229

Cited by 4 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Out-of-plane X-ray diffraction (XRD) patterns of thin-films before and after I 2 -dosing were recorded (Figure A). Remarkably, upon I 2 -dosing, we observed the almost disappearance of characteristic XRD peaks of AgTCNQ at 2θ ∼ 10.2°, 2θ ∼ 14.5°, and 2θ ∼ 20.6°. New diffraction peaks that appeared at 2θ ∼ 22.2° and 2θ ∼ 23.5° were found to be characteristic of respective (100) and (002) planes of the β-phase of AgI (Figure A and Supporting Information (SI) Figure S1).…”

Section: Resultsmentioning

confidence: 75%

See 1 more Smart Citation

Chemistry at the Solid–Gas Interface: Direct Crystalline Thin-Film to Thin-Film Chemical Transformation

et al. 2021

Self Cite

View full text Add to dashboard Cite

Single-crystal to single-crystal transformation is an elegant example of altering a crystalline solid-state of matter to a solid-state with a different chemical identity. Herein, we present an alluring example of thin-film to thin-film transformation of metal−organic to metal−halide by exploring chemistry at the solid−gas interface. Exposure of crystalline AgTCNQ (TCNQ = 7,7,8,8tetracyanoquinodimethane) thin-film to iodine (I 2 ) vapor and subsequent washing with chloroform (CHCl 3 ) generated crystalline AgI (silver iodide) thin-film. The chemical transformation AgTCNQ → AgI was so rapid that it took place within 2 min at ambient conditions. Reversible structural phase transition in the thin-film of AgI (β-phase ↔ α-phase) was further captured in variable temperature X-ray diffraction patterns, which appears promising for superionic conductivity and pyroelectricity applications.

show abstract

Section: Resultsmentioning

confidence: 75%

“…The Au substrate was thiolate functionalized by dipping the substrate into 1 mM solution of MUDA in ethanol and acetic acid (v/v = 9:1) for approximately 2 days followed by washing with ethanol and drying in a stream of N 2 gas. ,,− …”

Section: Methodsmentioning

confidence: 99%

Chemistry at the Solid–Gas Interface: Direct Crystalline Thin-Film to Thin-Film Chemical Transformation

et al. 2021

Self Cite

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

“…The fresh Ag NPs were collected by centrifugation, washed with water, and then freeze dried under vacuum for 12 h. Subsequently, 300 mg of fresh Ag NPs were dispersed into 250 mL of acetonitrile by ultrasound, and 50 mg of TCNQ dissolved in 20 mL of acetonitrile solution (2.5 mg/mL) was added into the suspension drop by drop under magnetic stirring condition. The Ag@AgTCNQ precursor was achieved due to the TCNQ molecule’s reaction with Ag NPs. − Keeping under magnetic stirring for half an hour, the precursor was collected by centrifugation and washed several times with acetonitrile and ultrapure water successively and then freeze dried under vacuum for 12 h once again.…”

Section: Methodsmentioning

confidence: 99%

Amorphous N_xC Coating Promotes Electrochemical CO₂ Deep Reduction to Hydrocarbons over Ag Nanocatalysts

et al. 2022

View full text Add to dashboard Cite

The electrochemical conversion of CO 2 into high value-added hydrocarbon products provides a promising path to reduce the dependence on fossil energy and close carbon cycle. Cubased catalyst is so far the only material that can effectively realize this process, limiting the optional catalysts for industrial application. Therefore, it is urgent to design other strategies to boost hydrocarbon products beyond Cu-based materials. Here, the N x C shell is constructed on the surface of Ag nanoparticle core (core−shell structure Ag@N x C) to boost the formation of CH 4 and CH 2 CH 2 . The N x C shell does not modify the electronic property of Ag but prolongs the residence time of the CO intermediate to enhance the C−C coupling and deep reduction, which are proved by in situ ATR-SEIRAS. In addition, the activated H 2 O molecules could provide sufficient adsorbed H to enhance the further reduction of the carbonaceous intermediate during the CO 2 reduction reaction. As a result, the Faradaic efficiency (FE) of the hydrogen evolution reaction is enhanced over the Ag@N x C-2 catalyst (∼12% at −1.4 V vs RHE), and the FEs of CH 4 and CH 2 CH 2 are significantly enhanced (above 43.8 and 8.4%, respectively). Our findings provide a strategy to achieve the conversion of CO 2 into hydrocarbon products over non-Cu-based catalysts.

show abstract

Direct Layer-by-Layer Growth of Crystalline Ag-TCNQ Thin Films on Functionalized Au Substrate: How Critical Is the pH of Ag(I) Solution?

Cited by 4 publications

References 23 publications

Chemistry at the Solid–Gas Interface: Direct Crystalline Thin-Film to Thin-Film Chemical Transformation

Chemistry at the Solid–Gas Interface: Direct Crystalline Thin-Film to Thin-Film Chemical Transformation

2D Metal‐Organic Complex Luminescent Crystals

Amorphous N_xC Coating Promotes Electrochemical CO₂ Deep Reduction to Hydrocarbons over Ag Nanocatalysts

Contact Info

Product

Resources

About

Direct Layer-by-Layer Growth of Crystalline Ag-TCNQ Thin Films on Functionalized Au Substrate: How Critical Is the pH of Ag(I) Solution?

Cited by 4 publications

References 23 publications

Chemistry at the Solid–Gas Interface: Direct Crystalline Thin-Film to Thin-Film Chemical Transformation

Chemistry at the Solid–Gas Interface: Direct Crystalline Thin-Film to Thin-Film Chemical Transformation

2D Metal‐Organic Complex Luminescent Crystals

Amorphous NxC Coating Promotes Electrochemical CO2 Deep Reduction to Hydrocarbons over Ag Nanocatalysts

Contact Info

Product

Resources

About

Amorphous N_xC Coating Promotes Electrochemical CO₂ Deep Reduction to Hydrocarbons over Ag Nanocatalysts