Electrochemistry-Induced Direct Deposition of Nanoscale Thin Zeolitic Imidazolate Framework-8 Films on Insulator Substrates

Journal Article · Fri Aug 18 04:00:00 EDT 2023 · Crystal Growth and Design

DOI:https://doi.org/10.1021/acs.cgd.3c00329· OSTI ID:1998549

Ito, Takashi ^[1]; Jenkins, Samantha G. ^[2]; Seifert, Soenke ^[3]; Uysal, Ahmet ^[3]

---

1. Kansas State University, Manhattan, KS (United States); Argonne National Laboratory (ANL), Argonne, IL (United States); Kansas State University
2. Kansas State University, Manhattan, KS (United States)
3. Argonne National Laboratory (ANL), Argonne, IL (United States)

Electrochemical approaches have been explored as controlled means to prepare thin films of metal–organic frameworks (MOFs) on electrodes but have rarely been used to form insulator films on insulator surfaces. Herein, we report an electrochemistry-based approach to direct deposition of a thin film of zeolitic imidazolate framework-8 (ZIF-8) onto an insulator surface. The film deposition was induced by a cathodic reaction at an electrode that was placed above the insulator with a separation of ≈100 μm in a methanol solution containing ZnCl₂ and 2-methylimidizole. The effects of the electrode and insulator material, applied potential, electrode–substrate distance, deposition time, and the number of deposition cycles were systematically investigated to gain insight into the deposition mechanism. The results of these measurements were consistent with a hypothesized mechanism involving cathodic base generation at the working electrode for ligand deprotonation, formation of intermediate species, their diffusion toward the substrate, and the formation of ZIF-8 on the substrate. Interestingly, the size, shape, and position of the film on the substrate replicated those of the working electrode, showing the applicability of this approach to the patterned deposition of a ZIF-8 film. In addition, film thickness could be easily controlled in the range of tens to hundreds of nanometers by adjusting the potential application conditions. Furthermore, this electrochemistry-induced method will provide a simple means for the patterned formation of a MOF film of controlled thickness on an insulator without metal precoating and thus will open the possibility of designing unique devices for various applications including chemical sensing and separations.

• Research Organization: Kansas State University, Manhattan, KS (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
• Grant/Contract Number: SC0002362
• OSTI ID: 1998549
• Alternate ID(s): OSTI ID: 2404936
• Journal Information: Crystal Growth and Design, Journal Name: Crystal Growth and Design Journal Issue: 9 Vol. 23; ISSN 1528-7483
• Publisher: American Chemical Society
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
controlled thickness
deposition
electrochemistry-based approach
electrodes
metal organic frameworks
patterned formation
platinum
thin ZIF-8 film
thin films