Transparent Wood Film Circuits for Foldable 3D Electronics
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Solution Overview
Problem
Traditional flexible electronic devices face challenges with insufficient interfacial bonding and durability due to high temperature and pressure processes, and plastic substrates contribute to environmental pollution, while current transparent wood-based devices are limited to simple planar designs and complex shape applications.
Innovation Solution
A conductive flexible transparent wood film is prepared by delignifying and hemicellulose removal treatments, followed by printing cellulose-based conductive ink on a transparent wood film using three-dimensional printing and origami technologies to enable deformable and editable shapes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional high temperature and high pressure preparation processes are used for flexible electronic devices, then the interfacial bonding between substrate and functional materials is improved, but the durability deteriorates and environmental pollution increases
Solution Approach 1:
The patent changes the preparation parameters from high temperature and high pressure to low temperature and low pressure conditions. The transparent wood film is prepared through delignification and hemicellulose removal treatments followed by low-pressure drying, avoiding the damaging effects of traditional high-energy processing while maintaining interfacial bonding quality.
Solution Approach 2:
The patent uses composite materials by combining transparent wood film with conductive inks containing silver nanowires, carbon nanotubes, or graphene. This composite structure achieves both good interfacial bonding and enhanced durability, as the natural wood substrate provides mechanical strength while the conductive additives provide electrical functionality without requiring high-temperature processing.
2Adaptability or versatility
If plastic substrates are used in flexible electronic devices, then the device flexibility is improved, but environmental pollution and ecological damage increase
Solution Approach 1:
The patent replaces persistent plastic substrates with biodegradable transparent wood film that can naturally decompose after use. The wood-based substrate maintains flexibility during the device's operational life but eliminates long-term environmental pollution by breaking down naturally in landfills or composting facilities, converting from a permanent pollutant to a temporary, benign material.
Solution Approach 2:
The delignification process uses sodium chlorite (NaClO2), a strong oxidant, to remove lignin from wood chips. This oxidation treatment transforms the opaque wood structure into a transparent film while preserving the cellulose framework, enabling both optical transparency and flexibility without requiring plastic materials.
3Adaptability or versatility
If transparent wood film is used for complex shape applications, then the shape adaptability is improved, but the mechanical strength and performance may deteriorate
Solution Approach 1:
The patent applies preliminary creasing and folding design to the transparent wood film before final device assembly. By pre-defining fold lines and crease patterns during the film preparation stage, the wood structure is guided to deform along predetermined paths, distributing mechanical stress evenly and preventing unexpected failure points that would occur with arbitrary complex shapes.
Solution Approach 2:
The patent divides complex three-dimensional shapes into multiple planar segments that can be independently fabricated and then assembled. By breaking down complex geometries into simpler flat sections connected by hinges or joints, each segment maintains its mechanical integrity while the overall structure achieves the desired complex configuration through modular assembly.
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 ensures mechanical performance and flexibility, allowing the transparent wood film to be folded into three-dimensional structures with programmable shapes and conductive properties, expanding application fields and enhancing wood utilization.
Implementation Method 1
performing a delignification treatment on a natural wood chip in an acidic buffer solution by using a NaClO2 solution to remove lignin in the wood chip
Implementation Method 2
placing the treated wood chip between a polyethersulfone membrane layer and a filter paper layer to be compressed under an external force for 24-48 hours (h) to obtain a transparent wood film
Implementation Method 3
printing cellulose-based conductive ink on a transparent wood film using three-dimensional printing
Data Source
AI summary
A conductive flexible transparent wood film-based electronic device and its preparation method are provided. The preparation method is to remove most lignin and part hemicellulose from natural wood chips to prepare a transparent wood film, and a CNT/TOCNFs ink is printed on a surface of the transparent wood film to form a circuit. The as-prepared transparent wood film has high mechanical properties, flexibility, and excellent optical strength. The conductive flexible transparent wood film is fabricated by depositing the CNT/TOCNFs ink on the surface of the transparent wood film to form conductive circuits, which is combined with origami and kirigami to realize the editable and adjustable design of spatial structure. Thus, the shape of the flexible electronic devices changes from simple to complex, simultaneously, they are customized to meet specific needs or applications.