PET Film for Graphene Transfer and Thin-Film Substrate Applications

Overview

PET film is a precision-engineered polyethylene terephthalate substrate widely employed in advanced materials research and microfabrication workflows—particularly as a temporary carrier membrane for wet-transfer processes of 2D materials such as graphene, transition metal dichalcogenides (TMDs), and hexagonal boron nitride (h-BN). Engineered for optical clarity and dimensional stability, this film operates on the principle of controlled mechanical adhesion and solvent-assisted release, enabling high-fidelity transfer of monolayer and few-layer nanomaterials onto target substrates (e.g., SiO₂/Si wafers, glass, or flexible polymers) without cracking, wrinkling, or residue formation. Its consistent thickness tolerance, low surface energy, and thermal resistance up to 150 °C support reproducible process integration in cleanroom-compatible fabrication protocols.

Key Features

• Optical Grade Clarity: >90% visible light transmittance (400–700 nm), enabling real-time optical inspection and alignment during transfer procedures.
• Surface Defect Control: Free of water ripples, gel particles, crystallites, and white creases—critical for minimizing interfacial voids and ensuring uniform contact during lamination.
• Dimensional Stability: Low coefficient of thermal expansion (CTE ≈ 15–17 ppm/°C) and minimal moisture absorption (<0.4% at 50% RH), preserving flatness across processing temperatures from −20 °C to +120 °C.
• Chemical Resistance: Resistant to alcohols, acetone, isopropanol, and mild aqueous etchants—compatible with standard cleaning, spin-coating, and lift-off chemistries.
• Mechanical Robustness: Tensile strength ≥170 MPa and elongation at break ≥80%, supporting manual handling, roll-to-roll processing, and vacuum-assisted lamination without tearing or plastic deformation.

Sample Compatibility & Compliance

This PET film is validated for use in academic, industrial, and contract R&D laboratories engaged in 2D material synthesis, flexible electronics prototyping, and thin-film sensor development. It meets baseline requirements for ISO 8502-3 (surface cleanliness assessment) and complies with RoHS Directive 2011/65/EU for restricted substances. While not certified to ASTM D882 (tensile properties) or ISO 527-3 (plastics—tensile testing) out-of-box, lot-specific test reports—including thickness uniformity mapping (±5 µm across 20 × 30 cm sheet), haze (<0.8%), and surface roughness (Ra < 0.5 nm, measured by AFM) —are available upon request for GLP-aligned documentation and audit readiness.

Software & Data Management

As a passive consumable substrate, this PET film does not incorporate embedded sensors or digital interfaces. However, its batch traceability supports full data lineage within laboratory information management systems (LIMS) and electronic lab notebooks (ELN). Each shipment includes a Certificate of Conformance (CoC) listing lot number, manufacturing date, nominal thickness, and QC inspection summary. For facilities operating under FDA 21 CFR Part 11 or ISO/IEC 17025 frameworks, custom documentation packages—including raw metrology logs and environmental exposure records—can be supplied to satisfy audit trail requirements.

Applications

• Carrier membrane for wet-transfer of CVD-grown graphene onto insulating or semiconducting substrates.
• Temporary support layer in polymer-assisted exfoliation of layered perovskites and MXenes.
• Substrate for inkjet-printed transparent electrodes, where optical transparency and surface smoothness directly influence film continuity and sheet resistance.
• Backing layer in flexible photodetector and organic photovoltaic (OPV) device stacks requiring thermal and solvent compatibility during encapsulation.
• Calibration reference for optical profilometry and interferometric thickness measurement systems due to its stable refractive index (n ≈ 1.65 @ 589 nm).

FAQ

What thickness options are available beyond the standard 125 µm and 200 µm variants?
Custom thicknesses ranging from 50 µm to 500 µm can be sourced upon minimum order quantity (MOQ) agreement; lead time extends by 4–6 weeks for non-stock calibrations.

Is this PET film compatible with O₂ plasma treatment prior to transfer?
Yes—surface activation via low-power O₂ plasma (≤100 W, 30–60 s) enhances hydrophilicity without inducing bulk degradation; recommended power density is ≤0.3 W/cm² to avoid ablation.

Can the film be sterilized for biomedical thin-film applications?
Ethylene oxide (EtO) sterilization is validated; gamma irradiation (>25 kGy) and autoclaving are not recommended due to risk of yellowing and embrittlement.

Do you provide pre-cut wafers or patterned versions (e.g., with alignment markers)?
Pre-cut 20 × 30 cm sheets are standard; custom die-cutting, UV lithography-defined fiducials, or conductive trace integration are available under NDA-supported engineering collaboration.