3D Nanostructures on Reduced Graphene for Flexible Devices
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Solution Overview
Problem
Current substrate materials for growing nanomaterials lack mechanical compliance, flexibility, and efficient electrical conductivity, limiting the development of flexible and scalable nanoelectric devices.
Innovation Solution
Three-dimensional nanostructures composed of nanotubes, nanowires, nanorods, and nanoparticles are grown on a mechanically compliant reduced graphene film using a metallic catalyst array deposited via a block copolymer nanotemplate and plasma-enhanced chemical vapor deposition process, enabling ohmic electrical contacts and enhanced mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If traditional brittle insulating oxide substrates (alumina, silica) are used for nanomaterial growth, then high temperature stability is achieved, but mechanical compliance and flexibility are lost
Solution Approach 1:
The patent uses a composite structure combining reduced graphene oxide film with nanomaterials (nanotubes, nanowires, nanorods, or nanoparticles). The graphene oxide substrate provides mechanical compliance and flexibility while the nanomaterials grown on top provide high temperature stability and desired functional properties, resolving the contradiction between mechanical flexibility and thermal stability
Solution Approach 2:
The patent changes the chemical and physical parameters of the substrate by reducing graphene oxide to graphene through thermal or chemical reduction processes. This parameter change transforms the substrate from a brittle insulator to a flexible conductive material that maintains mechanical compliance while enabling nanomaterial growth at elevated temperatures
2Stability of the object's composition
If traditional substrates are used, then high temperature stability is maintained, but electrical conductivity and ohmic contacts are compromised
Solution Approach 1:
The composite of reduced graphene oxide and nanomaterials creates a synergistic structure where graphene provides excellent electrical conductivity and ohmic contact properties, while the nanomaterials maintain high temperature stability. This composite approach simultaneously achieves both electrical reliability and thermal stability
Solution Approach 2:
The reduced graphene oxide film acts as an intermediary layer between the substrate and nanomaterials, providing a conductive pathway that enables ohmic electrical contacts while maintaining the structural integrity and thermal stability of the overall device structure at high temperatures
3Ease of manufacture
If conventional fabrication methods are used, then simple processes are maintained, but large-scale production of complicated device structures is limited
Solution Approach 1:
The patent employs preliminary patterning of the graphene oxide substrate and pre-positioning of catalyst particles before nanomaterial growth. This preliminary action enables complex device structures to be formed in subsequent steps, facilitating large-scale production of complicated structures while maintaining relatively simple overall fabrication processes
Solution Approach 2:
The fabrication process is segmented into distinct modular steps: graphene oxide deposition, pattern formation, catalyst particle placement, and controlled nanomaterial growth. This segmentation allows each step to be optimized independently and enables parallel processing for large-scale production while keeping individual steps simple and manageable
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 nanostructures exhibit excellent conductivity, flexibility, and elasticity, allowing for efficient electrical contacts and easy integration into field-emitting devices, while maintaining stability and scalability.
Implementation Method 1
growing nanomaterials via a plasma enhanced chemical vapor deposition (PECVD) process
Implementation Method 2
growing nanomaterials via a plasma enhanced chemical vapor deposition (PECVD) process
Data Source
AI summary
The present invention relates to a 3-dimensional nanostructure having nanomaterials stacked on a graphene substrate; and more specifically, to a 3-dimensional nanostructure having at least one nanomaterial selected from nanotubes, nanowires, nanorods, nanoneedles and nanoparticles grown on a reduced graphene substrate. The present invention enables the achievement of a synergy effect of the 3-dimensional nanostructure hybridizing 1-dimensional nanomaterials and 2-dimensional graphene. The nanostructure according to the present invention is excellent in flexibility and elasticity, and can easily be transferred to any substrate having a non-planar surface. Also, all junctions in nanomaterials, a metal catalyst and a graphene film system form the ohmic electrical contact, which allows the nanostructure to easily be incorporated into a field-emitting device.