Microporous Graphene Oxide Membrane via Template-Directed Carbon Deposition
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Solution Overview
Problem
Current methods for manufacturing microporous graphene membranes face challenges such as non-uniform pore sizes, low pore density, and high defect density, making them unsuitable for large-scale production and effective separation applications.
Innovation Solution
A method involving depositing carbon on a two-dimensional zeolite template, oxidizing the composite, and sonicating it in a solvent to produce microporous graphene oxide sheets with uniform pore sizes and high density, which are then stacked to form a defect-free membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ion bombardment or UV plasma is used to form defects in graphene, then microporous structure is created, but pore size distribution becomes non-uniform and pore density remains low
Solution Approach 1:
The patent changes the fundamental parameter of pore formation from top-down defect creation to bottom-up template-directed growth. By using amorphous silicon oxide template with controlled pore sizes and applying chemical vapor deposition with specific carbon sources, the method achieves uniform pore sizes (0.5-2 nm) and high pore density simultaneously, resolving the contradiction between precision and productivity.
Solution Approach 2:
The patent introduces amorphous silicon oxide as an intermediary template material that provides uniform pore structure. This template acts as a mediator between the desired uniform pore configuration and the carbon deposition process, enabling simultaneous achievement of high pore density and uniform pore size distribution that cannot be obtained by direct graphene defect formation methods.
2Productivity
If hydrogen peroxide oxidation is used to create pores in graphene, then high pore density is achieved, but pore size becomes irregular and conductivity decreases
Solution Approach 1:
The patent replaces hydrogen peroxide oxidation with amorphous silicon oxide template as an intermediary structure. This template physically defines uniform pore sizes during carbon deposition, eliminating the need for oxidative etching that creates irregular pores. The template method maintains high pore density while ensuring uniform pore size distribution and preserving graphene conductivity.
Solution Approach 2:
The patent substitutes the chemical oxidation mechanism (hydrogen peroxide) with a physical template-directed deposition mechanism. Instead of chemically etching random pores, the method uses a physically structured template (amorphous silicon oxide) to guide carbon deposition, achieving uniform pore formation without the harmful side effects of oxidation on conductivity.
3Manufacturing precision
If precursor synthesis and polymerization are used to create microporous graphene, then microporous structure is formed, but the process becomes complicated and uneconomical
Solution Approach 1:
The patent extracts the complex precursor synthesis and polymerization steps from the process. Instead of synthesizing porous polymer precursors and then converting to graphene, the method directly deposits carbon onto a porous silicon oxide template. This extraction of unnecessary intermediate steps simplifies the process while maintaining microporous structure formation, making it more economical.
Solution Approach 2:
The patent segments the process into two independent, simple steps: (1) forming amorphous silicon oxide template with desired pore structure, and (2) depositing carbon onto the template. This segmentation avoids the complex one-step polymerization process required by conventional methods, reducing process complexity while achieving the same microporous graphene outcome.
4Manufacturing precision
If carbon sheets are exfoliated into single sheets, then monoatomic thickness is achieved, but strong π-π attraction prevents effective dispersion
Solution Approach 1:
The patent uses amorphous silicon oxide template as an intermediary that prevents direct carbon sheet stacking during deposition. The template's porous structure allows carbon to deposit as isolated islands rather than continuous sheets, inherently preventing strong π-π attraction and enabling easy dispersion without requiring additional exfoliation steps.
Solution Approach 2:
Instead of starting with continuous carbon sheets and then attempting to exfoliate them (conventional approach), the patent inverts the process by directly forming discrete carbon islands on the template. This inversion eliminates the stacking problem at the source, making dispersion trivial while maintaining monoatomic thickness uniformity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The resulting membrane exhibits excellent selective permeability and high-quality performance for target materials, enabling its use in various applications like energy storage, filtration, and chemical detection, while being economical and suitable for mass production.
Implementation Method 1
depositing carbon on a zeolite template having a two-dimensional pore structure to prepare a carbon-zeolite composite
Implementation Method 2
oxidizing the carbon-zeolite composite
Implementation Method 3
treating the obtained product with sonication in a solvent to obtain a microporous graphene oxide sheet
Data Source
AI summary
Disclosed are a microporous graphene oxide sheet, a method of manufacturing the same, a dispersion including the same, and a membrane including a stack of the microporous graphene oxide sheet, the microporous graphene oxide sheet having an average size of pores ranging from about 0.1 nm to about 2 nm, wherein a spacing between pores is about 0.3 nm to about 10 nm, a standard deviation for the spacing between pores is less than or equal to about 5 nm.