Pristine graphene membranes supported on ceramic hollow fibre prepared via a sacrificial layer assisted CVD approach

Abstract

Graphene is a 2D ultra-thin material, when being used as membranes, potentially promises high permeation flux and can be operated in extreme conditions attributed to its chemical inertness. Currently, continuous atomic thin graphene membranes can only be made by chemical vapour deposition (CVD) on flat sheet, which limits its process intensification because of the low surfacearea-to-volume ratio. To tackle this challenge, we have successfully devised an unprecedented method to fabricate graphene membranes supported on ceramic hollow fibre via a nickel sacrificial layer approach. It starts with coating a continuous dense nickel sacrificial layer on yttrium-stabilised zirconia (YSZ) hollow fibre via electroless plating, followed by synthesis of a continuous graphene layer by CVD. After that, thermal oxygen etching followed by nitric acid leaching were performed to successfully remove the nickel layer, and defect-patching treatment was carried out to eliminate any major defects formed during the leaching process. Herein, a continuous ultra-thin graphene layer sitting on YSZ hollow fibre was obtained. The achieved graphene hollow fibre membrane exhibits a methanol flux of 2.4 LMH (L m −2 h −1) bar-1 and a remarkable 98.8 % rose bengal rejection. This study thus demonstrates a step towards successful engineering of pristine graphene membrane on microtubular supports.

A review on the synthesis and applications of sustainable copper-based nanomaterials

“…64 Using this method, coatings can be achieved on different types of supporting solid materials, such as powder, NMs, single crystals, and thin films of elemental, metal alloys and amorphous or crystalline compounds of different stoichiometry. 57,[65][66][67] The desired NMs can be grown with different properties by changing the experimental parameters including substrate material, substrate temperature, composition of the reaction gas mixture and total gas pressure flow. Accordingly, various NMs and single-atom materials can be prepared via the CVD technique, with high purity and environmentally friendly routes.…”

Advances in surface modification and functionalization for tailoring the characteristics of thin films and membranes via chemical vapor deposition techniques

“…In addition, it can serve as a critical step specially for the preparation of graphene-based devices. As can be seen in Table 2, different popular substrate materials such as graphene, 74 zeolite, 75 alumina 76,77 and silica 78,79 have been successfully modified by this technique. Particularly, hightemperature AP-CVD processes are gaining more attention in technologies such as solid-state electronic devices, such as high quality epitaxial semiconductor films for silicon bipolar and metal oxide semiconductor transistors.…”

In situ fluoro-oxygen codoped graphene layer for high-performance lithium metal anode

“…However, graphene-based materials are mostly fabricated via the modi-ed Hummers' method or CVD, which uses high-risk procedures or has a high demand for the instrument, thus hindering the large-scale application of graphene-based materials. 27,28 Here, we propose a straightforward and eco-friendly process for producing uorine-doped graphene oxide (FGO) and utilize the redox reaction between FGO and Cu to fabricate a lithiophilic layer on the current collector for Li metal battery. The resulting FGO@Cu anode exhibited excellent cycle performance and coulombic efficiency.…”

“…However, graphene-based materials are mostly fabricated via the modified Hummers' method or CVD, which uses high-risk procedures or has a high demand for the instrument, thus hindering the large-scale application of graphene-based materials. 27,28…”