Laser-Patterned Corrugated Carbon Network for Tunable Conductivity
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Solution Overview
Problem
Current methods for producing high-quality bulk carbon-based devices face challenges in achieving high surface area and electrical conductivity due to defects in graphite oxide's electronic structure, which are difficult to remove and pattern efficiently, often requiring expensive equipment and high temperatures.
Innovation Solution
A method using a low-cost infrared laser in a CD/DVD optical disc drive to reduce and pattern carbon-based oxide films, creating an interconnected corrugated carbon-based network with high surface area and tunable electrical conductivity without the need for reducing agents or expensive equipment, allowing direct control over conductivity and patterning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If graphite oxide is used as a precursor for large scale carbon-based materials, then water dispersibility and inexpensive production are achieved, but electrical conductivity is lost due to oxygen species creating defects in electronic structure
Solution Approach 1:
The patent applies parameter changes by controlling the reduction process of graphite oxide through laser irradiation. By adjusting laser power density, exposure time, and wavelength parameters, the oxygen content is reduced while maintaining electrical conductivity. This transforms the material from insulating graphite oxide to conductive carbon-based network by changing the chemical composition parameters.
Solution Approach 2:
The patent replaces traditional mechanical/chemical reduction methods (such as chemical reducing agents or high-temperature annealing equipment) with an optical system (laser). This substitution enables inexpensive production without requiring expensive chemical agents or high-temperature furnaces, while still achieving the desired electrical conductivity through photothermal reduction.
2Reliability
If high temperature annealing under chemical reducing gases is used to reduce graphite oxide, then electrical conductivity is improved, but expensive equipment and high energy consumption are required
Solution Approach 1:
The patent replaces thermal annealing equipment and chemical reducing gas systems with a laser optical system. The laser provides localized photothermal heating that reduces graphite oxide at lower overall temperatures, eliminating the need for expensive high-temperature furnaces and chemical reducing gases while achieving comparable or superior electrical conductivity.
Solution Approach 2:
The patent applies segmentation by using localized laser irradiation to reduce graphite oxide in specific patterned regions rather than uniformly heating the entire material. This allows selective reduction where conductivity is needed, energy efficiency, and direct patterning in a single step, avoiding waste of energy on non-patterned areas.
3Manufacturing precision
If conventional methods are used to pattern carbon-based devices, then basic patterns can be achieved, but the process is complex and requires photo-masks and multiple steps
Solution Approach 1:
The patent merges the reduction process and patterning process into a single integrated step. The laser simultaneously reduces graphite oxide to conductive carbon and patterns the desired geometry through computerized control of beam movement. This eliminates the need for separate photo-masking, development, and reduction steps, dramatically simplifying the manufacturing process while maintaining high precision.
Solution Approach 2:
The patent replaces the complex photo-masking mechanical system with a computerized laser positioning system. The laser beam is precisely controlled through digital programming to trace desired patterns directly on the graphite oxide, eliminating photo-masks, alignment mechanisms, and chemical development processes while achieving comparable or superior patterning precision.
4Reliability
If chemical reduction via hydrazine or other reducing agents is used, then graphite oxide reduction is achieved, but expensive chemicals and nitrogen impurities in the final product result
Solution Approach 1:
The patent replaces chemical reducing agents (hydrazine, borohydride, etc.) with a laser optical system. The laser induces photothermal reduction that removes oxygen functional groups from graphite oxide through controlled decomposition, eliminating the need for chemical agents and thereby preventing nitrogen impurity contamination in the final conductive carbon product.
Solution Approach 2:
The patent converts the harmful effect of oxygen functional groups (which cause insulating behavior) into a beneficial process. The laser energy selectively targets and removes these oxygen groups through controlled decomposition, transforming the insulating graphite oxide into conductive carbon. The oxygen is released as gas rather than forming harmful impurities, and the process can be controlled to minimize unwanted byproducts.
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 method produces carbon-based networks with high surface area and electrical conductivity, enabling the fabrication of flexible electronic devices and sensors with precise control over electrical properties, demonstrating improved electrochemical activity and scalability.
Implementation Method 1
a next step involves generating a light beam having a power density sufficient to reduce portions of the carbon-based oxide film to an interconnected corrugated carbon-based network
Implementation Method 2
generating a light beam having a power density sufficient to reduce portions of the carbon-based oxide film
Implementation Method 3
directing the light beam across the carbon-based oxide film in a predetermined pattern via a computerized control system
Data Source
AI summary
An interconnected corrugated carbon-based network comprising a plurality of expanded and interconnected carbon layers is disclosed. In one embodiment, each of the expanded and interconnected carbon layers is made up of at least one corrugated carbon sheet that is one atom thick. In another embodiment, each of the expanded and interconnected carbon layers is made up of a plurality of corrugated carbon sheets that are each one atom thick. The interconnected corrugated carbon-based network is characterized by a high surface area with highly tunable electrical conductivity and electrochemical properties.