Semi-Free-Standing HARM-Structure Films via Porous Substrate Transfer
Solution Overview
Problem
The fabrication and handling of free-standing films comprising high aspect ratio molecular structures like carbon nanotubes are challenging due to alignment limitations and difficulties in synthesizing thin, transparent, and homogeneous layers using existing methods, which restricts their application in various devices.
Innovation Solution
A method involving the deposition of high aspect ratio molecular structures onto a preliminary substrate, followed by transfer onto a support with an opening, allowing the network to be partially supported at the periphery while being unsupported in the middle, enabling the creation of semi-free-standing films with randomly oriented structures, which can be easily manipulated and integrated into devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If free-standing films of HARM-structures are fabricated using conventional methods (buckypaper formation), then the films can be produced, but the nanotube molecules become aligned in the sheet which limits application possibilities
Solution Approach 1:
The invention changes the fabrication parameters by using a different formation mechanism (filtration through porous substrate) compared to conventional methods (domino pushing), which results in randomly oriented HARM-structures instead of aligned structures, thereby maintaining versatility for different applications
2Manufacturing precision
If conventional buckypaper formation methods are used, then films can be synthesized, but it is challenging to produce very thin, very transparent and homogeneous layers
Solution Approach 1:
The invention replaces the mechanical domino pushing system with a filtration-based system where HARM-structures are deposited and formed through a porous substrate, enabling precise control over film thickness, transparency and homogeneity through filtration parameters rather than mechanical force
3Ease of manufacture
If free-standing buckypaper of single walled CNTs is fabricated, then the material can be produced, but the fabrication process remains challenging
Solution Approach 1:
The invention introduces a porous substrate as an intermediary element that facilitates the formation of free-standing HARM-structure films. The substrate acts as a temporary support during filtration and formation, making the process more reliable and easier to manufacture compared to direct free-standing formation methods
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 production of semi-free-standing networks with improved electrical, thermal, and mechanical properties, enabling applications in optical, mechanical, and sensing devices, while eliminating substrate-related issues like optical absorption and heat transfer limitations, and facilitating easy incorporation and modification of the network.
Implementation Method 1
fabricating an essentially planar network of HARM-structures on a preliminary substrate by depositing HARM-structures onto the preliminary substrate
Data Source
AI summary
A structure comprising high aspect ratio molecular structures (HARM-structures), wherein the structure comprises an essentially planar network (2) of HARM-structures, and a support (3) in contact with the network (2). The support (3) has an opening (5) therein, at the peripheral region (4) of which opening (5) the network (2) is in contact with the support (3), such that the middle part of the network (2) is unsupported by the support (3). The network (2) comprises essentially randomly oriented HARM-structures.