In Situ Synthesis of ZIF-67 Thin Films Using Low Temperature Chemical Vapor Deposition to Fabricate All-Solid-State Flexible Interdigital in-Planar Microsupercapacitors

Abstract

This work describes the fabrication of a flexible all-solid-state interdigital in-planar microsupercapacitor (μSC) using the in situ synthesized ZIF-67 thin films as the interdigital finger-electrode materials, platinum (Pt) thin film as the interdigital finger-electrode current collector, laser print technology for the fabrication of interdigital patterns, and low-cost commercial polyethylene terephthalate (PET) sheet as the flexible substrates, assembled with the NaOH/PVA gel electrolyte. ZIF-67 thin films are in situ synthesized onto PET substrate by ultralow temperature (ULT) chemical vapor deposition (CVD) technology at a low temperature of 140°C. We herein report the ULT CVD approach for gas phase synthesizing ZIF-67 thin films, the exactly heating temperature can produce vaporized water steam, sublimated 2-methylimidazole (2-MIM) and cobalt(II) acetylacetonate (Co(acac)2) vapors at the same time. The vaporized and sublimated gaseous precursors demonstrated molecular-level reactions, including the deprotonation of 2-MIM via water steam, and the following coordinated reactions with cobalt ions decomposed from Co(acac)2, for the efficiently straightforward deposition to form the uniform ZIF-67 thin films onto the substrate surface. Herein, the integration of pattern printing, CVD depositing ZIF-67 thin films, and lift-off patterning processes demonstrated a comprehensive achievement and good compatibility to integrate MOFs into miniaturized energy-storage devices.

Flexible and durable conductive nickel/graphene‐coated polyethylene terephthalate fabric for highly efficient electromagnetic shielding

“…Figure 4 shows XRD patterns of the Gr‐PET and various Ni/Gr‐PET fabrics. The XRD curve of the Gr‐PET fabric shows the three main diffraction peaks at 18.0, 23.0, and 25.8° belonging to the miler indices of (010), , and (100) of PET substrate (JCPDS card number: 00‐050‐2275), respectively, in beneficial consent with that of the other researchers for PET fabric 30,34–36 . After nickel nanoparticles are coated on the surface of fabrics, the electroplated nickel morphology has an important effect on the crystalline structure of fabrics.…”

“…The average EMI shielding effectiveness in 8–12 GHz of the Gr‐PET and various Ni/Gr‐PET fabrics are displayed in Figure 5D. The shielding effectiveness of −20, −40, and −70 dB means that 99%, 99.99%, and 99.99999%, respectively, the incident EM waves are not transmitted from shields 34–36 . The EMI shielding effectiveness ranges for general and high‐performance applications are (−20, −40 dB) and (−40, −70 dB), respectively.…”

“…À Á , and (100) of PET substrate (JCPDS card number: 00-050-2275), respectively, in beneficial consent with that of the other researchers for PET fabric. 30,[34][35][36] After nickel nanoparticles are coated on the surface of fabrics, the electroplated nickel morphology has an important effect on the crystalline structure of fabrics. Therefore, the XRD spectra of all Ni/Gr-PET fabrics display the three intensive peaks at nearby 45, 52, and 77 matching the plane spectra of Ni/Gr-PET fabric have no other peaks, which are not forming any impurities such as nickel oxide during the nickel deposition process.…”

“…The shielding effectiveness of À20, À40, and À70 dB means that 99%, 99.99%, and 99.99999%, respectively, the incident EM waves are not transmitted from shields. [34][35][36] The EMI shielding effectiveness ranges for general and high-performance applications are (À20, À40 dB) and (À40, À70 dB), respectively. The average EMI shielding effectiveness of the Ni/Gr-PET-5, Ni/Gr-PET-10, Ni/Gr-PET-15, and Ni/Gr-PET-20 fabrics is achieved at À55.96, À59.11, À70.00, and À 68.47 dB, respectively.…”

Studies toward Morphological Changes of Silver/Carbon Fiber Composites and Their Optimization for High-Performance Electrochemical Electrodes

“…Thus, it is crucial to investigate the physiochemical properties of the active and support materials to enhance the overall performance of the electrode system [26,27]. Notably, highly porous supporting substrates facilitate the diffusion of reaction substances to electrically active regions within the electrodes [28][29][30]. Recently, carbon-based materials (e.g., carbon nanotube (CNT), graphene, carbon fiber (CF), and carbon felt) have emerged as promising materials for supporting electrochemical electrode materials owing to their porous networks, high electronic conductivity, and robust mechanical stability [31].…”