Nanochannel Fabrication via Overlayer Masking and Ion Beam Milling
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Solution Overview
Problem
Current methods for fabricating nanochannels struggle to achieve dimensions below 10 nm, which are crucial for advanced lab-on-a-chip devices and single molecule studies, due to limitations in resolution and surface smoothness.
Innovation Solution
The method involves using a thick overlayer on a substrate, milling channels through the overlayer, and then removing the overlayer to create nanochannels with dimensions as small as 0.5-10 nm, utilizing focused ion beam milling and subsequent processing to achieve smooth surfaces and precise dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography and etching techniques are used to fabricate nanochannels, then the manufacturing process is relatively simple, but the resolution limit prevents achieving dimensions below 10 nm
Solution Approach 1:
The patent employs a template structure as an intermediary element to define the nanochannel geometry. The template comprises a porous layer with controlled pore sizes that serve as masks during ion beam milling, enabling precise nanochannel dimensions without relying on direct photolithographic patterning. This intermediary approach overcomes the resolution limits of conventional photolithography while maintaining fabrication feasibility.
Solution Approach 2:
The patent replaces conventional photolithographic optical systems with ion beam milling technology. Instead of using light-based patterning that is limited by optical resolution, the invention uses focused ion beams to physically remove material through the template structure, achieving sub-10 nm dimensions that are unattainable with traditional optical methods.
2Manufacturing precision
If ion beam milling is used to achieve sub-10 nm nanochannels, then manufacturing precision is improved, but the fabrication process becomes more complex
Solution Approach 1:
The patent performs preliminary actions by first forming the template structure with the porous layer before performing the ion beam milling. The template is prepared in advance with the desired pore geometry, which then guides the subsequent milling process to create precisely defined nanochannels. This preliminary template formation simplifies the overall process by breaking down the complex nanofabrication into manageable sequential steps.
3Difficulty of detecting and measuring
If nanochannels with dimensions below 10 nm are fabricated, then single molecule analysis capability is enabled, but surface smoothness and device longevity are compromised
Solution Approach 1:
The patent utilizes parameter changes in the ion beam milling process, specifically controlling beam energy, current, and incidence angle, to achieve both sub-10 nm dimensions and smooth channel surfaces. By optimizing these parameters, the process creates nanochannels that maintain structural integrity and surface quality, enabling long-term device reliability while preserving single molecule detection capability.
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
This approach allows for the fabrication of nanochannels with sub-10 nm dimensions and smooth surfaces, enabling efficient fluidic transport and analysis of single molecules, such as DNA, with improved resolution and longevity of the devices.
Implementation Method 1
milling at least one channel through the overlayer into the substrate
Implementation Method 2
The overlayer can be removed by chemical etching, peeling, ultrasonic welding, or any other suitable means
Implementation Method 3
providing a substrate having a thick single or a thick multi-layer overlayer; milling at least one channel through the overlayer into the substrate
Implementation Method 4
The overlayer can be removed by chemical etching, peeling, ultrasonic welding, or any other suitable means
Data Source
AI summary
Methods of forming at least one nanochannel include: (a) providing a substrate having a thick single or a thick multi-layer overlayer; (b) milling at least one channel through the overlayer into the substrate; then (c) removing the overlayer; and (d) forming at least one nanochannel in the substrate having an average width and depth dimension that is less than about 10 nm in response to the milling and removing steps.