Multifaceted Hybrid Carbon Fibers - Applications in Renewables, Sensing and Tissue Engineering

At a Glance

Metadata	Details
Publication Date	2020-08-16
Journal	Journal of Composites Science
Authors	Chandreyee Manas Das, Lixing Kang, Guang Yang, Dan Tian, Ken‐Tye Yong
Institutions	Nanyang Technological University, Nanjing Forestry University
Citations	8
Analysis	Full AI Review Included

Technical Analysis of Hybrid Carbon Fibers for Advanced Applications

Executive Summary

This technical documentation analyzes the findings of the review “Multifaceted Hybrid Carbon Fibers” and positions 6CCVD’s MPCVD diamond materials as the superior, next-generation solution for replicating and extending this research in high-performance engineering fields.

Core Research Focus: Hybrid Carbon Fibers (CF/CNF) significantly enhance the mechanical, thermal, and electrical properties of composites for applications in renewables (batteries, supercapacitors, solar cells), advanced sensing, and tissue engineering.
Performance Drivers: Enhanced device performance is attributed to high surface area, increased electrical conductivity (due to tunneling effects), and superior tensile/compressive strengths of the carbon allotropes used.
Synthesis Methodologies: CNFs are primarily prepared via Catalytic Thermal Chemical Vapor Deposition (CVD) and electrospinning followed by heat treatment, aligning with 6CCVD’s core CVD expertise.
Sensing Applications: CF/CNF composites enable highly sensitive biosensors (e.g., glucose, H₂O₂) and gas sensors (H₂, NO, CO) by providing increased electrochemically active sites and faster mass transport.
6CCVD Value Proposition: While CF/CNF offers improvements, MPCVD Diamond (SCD/PCD/BDD) represents the ultimate carbon allotrope, providing unmatched chemical inertness, thermal management, and electrochemical stability necessary for commercializing these high-demand devices.
Electrochemical Superiority: Boron-Doped Diamond (BDD) is the ideal electrode material, offering a wider solvent window and superior catalytic activity compared to the graphitic carbon structures discussed in the review.

Technical Specifications

The following table summarizes key performance metrics achieved using hybrid carbon fiber composites, highlighting the high-performance targets 6CCVD materials are designed to exceed.

Parameter	Value	Unit	Context
Electrical Conductivity (Hybrid CF)	26	S cm^-1	PAN nanofibers + 3 wt% MWCNT addition [3]
Fracture Resistance Enhancement	78	%	Addition of 1.0 wt% CNF in epoxy [1]
Tensile Strength Enhancement	49	%	4.0 wt% CNF in thermal-plastic polyurethane (TPU) [1]
Interlaminar Shear Strength (ILSS) Enhancement	90	%	BNNP-CNT hybrid nanocomposites [5]
Supercapacitor Specific Capacitance	1130 ± 100	F g^-1	CF/poly(DMcT)/PPy composite [28]
DSSC Efficiency (Pt/CF)	8.97	%	Pt/CF composite counter electrode [46]
Glucose Sensor Sensitivity	1650.6	µA mM^-1 cm^-2	β-MnO₂ micro/nanorod arrays on CF fabric [54]
H₂O₂ Sensor Detection Limit	0.35	µM	Pt NP doped carbon fiber ultramicroelectrode [62]
SCD Polishing Surface Roughness (6CCVD Standard)	< 1	nm (Ra)	Ultra-smooth surface for thin-film deposition

Key Methodologies

The research relies on advanced material synthesis and modification techniques to achieve enhanced performance. 6CCVD utilizes similar high-precision CVD methods to produce diamond materials with controlled properties.

Carbon Nanofiber (CNF) Synthesis:
1. Catalytic Thermal Chemical Vapor Deposition (CVD): Utilizes metal catalysts (Iron, Nickel, Cobalt, Chromium, Vanadium) and carbon sources (Molybdenum, Methane, CO, Ethyne, Ethene).
2. Temperature Range (CVD): 700 K to 1200 K (427 °C to 927 °C).
3. Electrospinning: Polymer nanofibers (e.g., PAN, PVA, PI, PBI) are used as precursors.
4. Heat Treatment/Carbonization: Follows electrospinning to carbonize polymer nanofibers, controlling shape, porosity, and diameter.
Hybridization and Functionalization:
- Nanoparticle Decoration: CFs are coated or embedded with nanoparticles (e.g., MgO, Pt, NiCu, Co-TiC, MnO₂) to enhance thermal, electrical, or catalytic activity.
- Surface Modification: Chemical treatments (e.g., poly methacrylic acid, carboxyl/hydroxyl functionalization) are used to improve interfacial adhesion between the carbon fiber and the matrix material (e.g., epoxy, nylon).
- Composite Fabrication: Blending CNF/CF with various matrices (elastomers, thermoplastics, ceramics) to form composites with enhanced mechanical properties (e.g., increased fracture resistance, tensile strength).

6CCVD Solutions & Capabilities

The research demonstrates a clear demand for carbon-based materials offering extreme electrical conductivity, chemical inertness, and mechanical robustness—properties where MPCVD diamond excels. 6CCVD provides the necessary materials and customization to advance this research beyond conventional graphitic carbon fibers.

Applicable Materials

To replicate or extend the high-performance electrode and sensing applications detailed in this review, 6CCVD recommends the following materials:

Boron-Doped Diamond (BDD):
- Application: Ideal for electrochemical sensing (H₂O₂, glucose, neurotransmitters) and high-stability electrodes (batteries, supercapacitors, fuel cells). BDD offers the widest potential window, superior corrosion resistance, and high catalytic activity, significantly outperforming graphitic CF/CNF electrodes in harsh or acidic environments (e.g., Vanadium Redox Flow Batteries [18]).
- Format: Available as thin films (0.1 µm) or thick plates (up to 500 µm) for robust electrode fabrication.
Optical Grade Single Crystal Diamond (SCD):
- Application: Required for high-power thermal management (heat dissipation in renewables) and high-strength structural components (aerospace, implants). SCD offers the highest known thermal conductivity and exceptional mechanical strength.
- Format: Available in custom dimensions up to 125mm, with ultra-low surface roughness (Ra < 1nm) for precision integration.
Polycrystalline Diamond (PCD) Substrates:
- Application: Cost-effective, large-area substrates (up to 125mm) for depositing thin-film sensors or serving as robust, conductive platforms where the high thermal conductivity of SCD is not strictly required.

Customization Potential

The complexity of the hybrid structures (e.g., core-sheath fibers, nanoparticle decoration) necessitates highly customizable substrate and metalization capabilities, which 6CCVD provides in-house.

Research Requirement (from Paper)	6CCVD Customization Capability	Benefit to Researcher
Custom Electrode Geometry (e.g., fiber-shaped, microelectrodes)	Custom laser cutting and shaping of SCD/PCD wafers.	Enables rapid prototyping of unique sensor and electrode architectures.
Metal Nanoparticle Integration (e.g., Pt, Ni, Co, Au)	Internal metalization services (Au, Pt, Pd, Ti, W, Cu).	Allows for direct deposition of catalytic metals onto BDD/SCD surfaces, ensuring superior adhesion and electrical contact compared to polymer blending.
Large-Area Substrates (e.g., for commercialization)	Plates/wafers up to 125mm (PCD).	Supports scaling up of renewable energy devices (solar cells, supercapacitors) and large-format sensing arrays.
Ultra-Smooth Surfaces (for thin-film deposition)	Polishing to Ra < 1nm (SCD) and < 5nm (PCD).	Essential for high-quality, defect-free deposition of active materials (e.g., MoS₂, MnO₂) onto the carbon substrate.

Engineering Support

6CCVD’s in-house PhD team specializes in the material science of carbon allotropes and advanced CVD techniques. We can assist researchers and engineers with material selection and optimization for similar Electrochemical Sensing, Energy Storage, and High-Strength Composite projects. Our expertise ensures that the transition from conventional CF/CNF to high-performance diamond materials is seamless and optimized for maximum device efficiency and longevity.

For custom specifications or material consultation, visit 6ccvd.com or contact our engineering team directly.

View Original Abstract

The field of material science is continually evolving with first-class discoveries of new nanomaterials. The element carbon is ubiquitous in nature. Due to its valency, it can exist in various forms, also known as allotropes, like diamond, graphite, one-dimensional (1D) carbon nanotube (CNT), carbon fiber (CF) and two-dimensional (2D) graphene. Carbon nano fiber (CNF) is another such material that falls within the category of CF. With much smaller diameters (around hundreds of nanometers) and lengths in microns, CNFs have higher aspect (length to diameter) ratios than CNTs. Because of their unique properties like high electrical and thermal conductivity, CNFs can be applied to many matrices like elastomers, thermoplastics, ceramics and metals. Owing to their outstanding mechanical properties, they can be used as reinforcements that can enhance the tensile and compressive strain limits of the base material. Thus, in this short review, we take a look into the dexterous characteristics of CF and CNF, where they have been hybridized with different materials, and delve deeply into some of the recent applications and advancements of these hybrid fiber systems in the fields of sensing, tissue engineering and modification of renewable devices since favorable mechanical and electrical properties of the CFs and CNFs like high tensile strength and electrical conductivity lead to enhanced device performance.

Tech Support

Original Source

DOI: https://doi.org/10.3390/jcs4030117

References

2014 - Carbon nanofibers and their composites: A Review of synthesizing, properties and applications [Crossref]
2018 - advanced carbon fibre composites via poly methacrylic acid surface treatment; surface analysis and mechanical properties investigation [Crossref]
2013 - Desirable electrical and mechanical properties of continuous hybrid nano-scale carbon fibers containing highly aligned multi-walled carbon nanotubes [Crossref]
2015 - Effects of nano-sized and micro-sized carbon fibers on the interlaminar shear strength and tribological properties of high strength glass fabric/phenolic laminate in water environment [Crossref]
2015 - Enhancement of flexural and shear properties of carbon fiber/epoxy hybrid nanocomposites by boron nitride nano particles and carbon nano tube modification [Crossref]
2013 - Highly aligned polyacrylonitrile-based nano-scale carbon fibres with homogeneous structure and desirable properties [Crossref]
2015 - Mechanical and thermal properties of carbon fiber/polypropylene composite filled with nano-clay [Crossref]
2015 - Mechanical properties and cytocompatibility of carbon fibre reinforced nano-hydroxyapatite/polyamide66 ternary biocomposite [Crossref]
2017 - Mgo nanoparticles-decorated carbon fibers hybrid for improving thermal conductive and electrical insulating properties of nylon 6 composite [Crossref]
2015 - Modified nano-magnetite coated carbon fibers magnetic and microwave properties [Crossref]