Nitrogen-Sulfur Doped Graphene via Low-Temperature Microbial Reduction
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Solution Overview
Problem
Existing methods for producing nitrogen and sulfur-doped graphene (N,S-DDG) involve high temperatures, toxic chemicals, and pose environmental and health risks, with unsatisfactory performance and scalability issues due to the sensitivity of sulfate-reducing bacteria (SRB) to graphene oxide (GO) concentrations.
Innovation Solution
A process using specially selected microorganisms from the Halobacteria class, such as Halalkaliarchaeum desulfuricum and Natronolimnobius sulfurireducens, to dope graphene oxide with nitrogen and sulfur at lower temperatures and under controlled conditions, minimizing the use of toxic substances and ensuring high efficiency and scalability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If Chemical Vapor Deposition (CVD) at 800°C is used to dope graphene oxide with nitrogen and sulfur, then the doping effectiveness is improved, but the energy consumption increases and toxic chemicals must be handled
Solution Approach 1:
The patent changes the temperature parameter from 800°C to physiological temperatures (20-40°C) and replaces the CVD process with a biological process using engineered bacteria, thereby reducing energy consumption while maintaining doping effectiveness through genetic modification of the bacterial system
Solution Approach 2:
The patent replaces the thermal/chemical CVD mechanism with a biological mechanism using engineered bacteria that naturally incorporate nitrogen and sulfur into graphene oxide through metabolic processes, substituting high-energy physical-chemical processes with low-energy biological processes
2Object-affected harmful factors
If sulfate-reducing bacteria are used to reduce graphene oxide, then the toxicity of chemicals is reduced, but the scalability is limited due to sensitivity to graphene oxide concentration
Solution Approach 1:
The engineered bacteria possess intrinsic capabilities to reduce graphene oxide and incorporate dopants through their natural metabolic pathways, eliminating the need for external toxic chemicals while maintaining scalability through biological self-sufficiency
Solution Approach 2:
The patent modifies the bacteria genetically to change their metabolic parameters, enabling them to tolerate and process higher concentrations of graphene oxide, thereby overcoming the scalability limitation while maintaining low toxicity
3Productivity
If high concentrations of graphene oxide are used in bacterial reduction processes, then the production efficiency is improved, but the bacteria become sensitive and the process becomes difficult to control
Solution Approach 1:
The engineered bacteria autonomously manage the reduction process through their modified metabolic pathways, self-regulating their interaction with graphene oxide at high concentrations without requiring external control mechanisms, thereby maintaining both efficiency and controllability
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 process produces N,S-DDG with excellent electrical conductivity and catalytic properties, achieving high insertion rates of nitrogen and sulfur atoms into graphene oxide without environmental harm, enabling cost-effective and eco-friendly large-scale production.
Implementation Method 1
a reduction phase of graphene oxide (GO) by means of microorganisms
Implementation Method 2
contacting a culture of selected microorganisms with a mixture of graphene oxide (GO) to obtain the doping with Nitrogen and Sulfur
Data Source
AI summary
A process to produce graphene dual doped with nitrogen and sulfur atoms through a reduction of graphene oxide by microorganisms. Also, graphene dual doped with nitrogen and sulfur atoms obtainable by this process, and the use of the doped graphene to produce e.g. electronic components or water purification equipment. The process is eco-sustainable and economic with the additional advantage of providing a product with significantly improved performance compared to known products.