Deletable Carbon Nanotube Circuits via Selective Junction Inactivation
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Solution Overview
Problem
Traditional silicon lithography techniques become inadequate as device sizes shrink, necessitating a shift in materials and circuit design to maintain performance according to Moore's Law, and existing methods struggle to effectively utilize carbon nanotubes for constructing responsive circuits.
Innovation Solution
A method involving an array of carbon nanotubes with intersecting segments forming electrically responsive junctions, where at least one segment or junction is selectively inactivated using electromagnetic energy, electron beams, chemical attacks, or voltage applications, allowing for the creation of deletable nanotube circuits with nonlinear current-voltage responses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If traditional silicon lithography techniques are used, then manufacturing processes are well-established, but device sizes cannot continue to shrink effectively
Solution Approach 1:
The patent replaces traditional mechanical silicon lithography techniques with a chemical self-assembly approach using DNA-directed carbon nanotube positioning. This substitution enables continued miniaturization by using molecular-scale DNA structures to guide nanotube placement, bypassing the physical limitations of conventional lithography while maintaining manufacturing feasibility through chemical processes.
Solution Approach 2:
The patent transitions from silicon-based materials to carbon nanotube materials, fundamentally changing the material parameter. This material substitution allows device dimensions to shrink further because carbon nanotubes can be positioned and manipulated at smaller scales through chemical and electromagnetic methods, overcoming the lithography resolution limits that constrain silicon-based fabrication.
2Productivity
If carbon nanotubes are used to maintain Moore's Law, then device scaling is enabled, but effective circuit construction methods are lacking
Solution Approach 1:
The patent applies preliminary action by pre-assembling carbon nanotubes into arrays with predetermined geometric patterns and electrical properties before circuit construction. This pre-positioning enables efficient circuit building because subsequent steps only require selective activation or connection of pre-placed nanotubes, rather than constructing circuits from scratch, thereby improving both construction efficiency and design flexibility.
Solution Approach 2:
The patent introduces DNA molecules as intermediary structures that mediate between the carbon nanotubes and the circuit design process. These DNA intermediaries provide a programmable interface for positioning nanotubes and controlling their electrical characteristics, enabling versatile circuit design while maintaining efficient construction through standardized molecular assembly protocols.
3Reliability
If nanotube segments are selectively inactivated, then circuit functionality is improved, but additional processing steps are required
Solution Approach 1:
The patent applies the extraction principle by selectively removing or inactivating specific nanotube segments from the array after initial assembly. This extraction approach improves circuit reliability by eliminating defective or unwanted conductive paths while maintaining the overall array structure, and the localized nature of the extraction minimizes the additional processing complexity compared to complete circuit reconstruction.
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
Enables the construction of efficient and scalable carbon nanotube circuits with improved performance by selectively modifying nanotube segments and junctions, addressing the limitations of traditional silicon lithography and enhancing circuit design capabilities.
Implementation Method 1
Inactivating may including application of electromagnetic energy (e.g., by directing a laser towards the segment or junction)
Implementation Method 2
Inactivating may including application of electromagnetic energy (e.g., by directing a laser towards the segment or junction), application of an electron beam
Implementation Method 3
chemical attack (e.g., by an activatable composition such as a photochemical, an enzyme, or a targetable composition such as a nucleotide-containing composition)
Implementation Method 4
application of a voltage. Application of a voltage may include applying the voltage to segments and/or to junctions, and may include application of timed pulses
Data Source
AI summary
Carbon nanotube template arrays may be edited to form connections between proximate nanotubes and/or to delete undesired nanotubes or nanotube junctions.