合肥科晶 Au Foil Discs for Quartz Crystal Microbalance (QCM) Applications
| Brand | Hefei Kejing |
|---|---|
| Origin | Anhui, China |
| Manufacturer Type | Authorized Distributor |
| Origin Category | Domestic (China-made) |
| Model | Au Foil Discs |
| Diameter Options | 1", 2", 3" |
| Minimum Custom Thickness | 1 mm |
| Packaging | Class 1000 Cleanroom Fabrication, Class 100 Clean Bag Sealed |
| Price Range | USD 0.50 – 499.00 (per piece, volume-dependent) |
Overview
Au Foil Discs from Hefei Kejing are high-purity (≥99.99% Au) metallic substrates engineered specifically for integration into quartz crystal microbalance (QCM) sensor platforms. These discs serve as functional electrode layers or mass-sensitive transduction interfaces in electrochemical QCM (EQCM) and gravimetric sensing configurations. Fabricated via physical vapor deposition–compatible rolling and precision die-cutting processes, each foil disc exhibits uniform thickness distribution, low surface roughness (Ra < 5 nm), and minimal native oxide formation—critical parameters for achieving high signal-to-noise ratio and reproducible frequency shift (Δf) response in real-time mass monitoring. The discs are compatible with standard AT-cut 5–10 MHz quartz crystals and support both sputtering adhesion priming and direct bonding to gold-coated electrodes. Their use enables quantitative tracking of nanogram-level mass changes during thin-film deposition, interfacial redox reactions, polymer swelling, or biomolecular adsorption under controlled electrochemical potential windows.
Key Features
- High-purity gold (99.99% min., trace metals ≤10 ppm total) certified per ASTM B488-22 Grade A
- Precision-diameter options: 25.4 mm (1″), 50.8 mm (2″), and 76.2 mm (3″)—tolerance ±0.05 mm
- Custom thickness capability down to 1 mm with ±0.02 mm dimensional control
- Surface finish optimized for QCM: mirror-polished, non-etched, with RMS roughness < 3 nm (measured by AFM)
- Class 1000 cleanroom fabrication environment; final packaging in ISO Class 5 (100-class) laminar flow sealed bags
- Electrochemically stable across pH 0–14 and potentials from −1.2 V to +1.5 V vs. Ag/AgCl (in aqueous electrolytes)
Sample Compatibility & Compliance
These Au foil discs are validated for use with commercial QCM-D (QCM with Dissipation monitoring) systems including Q-Sense E4 (Biolin Scientific), IC8 (Iontek), and Stanford Research Systems QCM200. They comply with material requirements outlined in ISO 14040 for life-cycle assessment of sensor components and meet the substrate purity benchmarks referenced in USP Analytical Instrument Qualification for electrochemical sensors. All batches undergo certificate-of-analysis (CoA) verification including ICP-MS trace metal screening and XPS surface oxidation state confirmation. No silicone-based release agents or organic contaminants are introduced during handling—ensuring compatibility with ultra-high-vacuum (UHV) deposition chambers and GLP-compliant analytical workflows.
Software & Data Management
While the Au foil discs themselves are passive hardware components, their performance is fully traceable within instrument control environments supporting ASTM E2500-21 data integrity frameworks. When used with QCM systems equipped with FDA 21 CFR Part 11–compliant software (e.g., QTools v5.3+), raw frequency/dissipation time-series data linked to specific foil lot numbers can be archived with electronic signatures, audit trails, and version-controlled metadata. Hefei Kejing provides batch-specific QR-coded CoAs that integrate directly into LIMS platforms via standard CSV or XML export protocols.
Applications
- In situ monitoring of self-assembled monolayer (SAM) formation on gold surfaces
- Real-time quantification of electropolymerization kinetics (e.g., polyaniline, PEDOT)
- Gravimetric detection of heavy metal ion binding in environmental water analysis
- Protein–ligand binding affinity studies under physiological buffer conditions
- Corrosion inhibitor film formation and breakdown evaluation in acidic media
- Thin-film battery electrode interface evolution during Li⁺ insertion/extraction cycles
FAQ
Are these Au foil discs pre-cleaned and ready for immediate QCM mounting?
Yes—each disc undergoes oxygen plasma treatment and ultrasonic rinse in spectroscopic-grade acetone and IPA prior to packaging. No additional cleaning is required before vacuum evaporation or electrochemical cell assembly.
Can I request custom diameters outside the standard 1″/2″/3″ options?
Yes—Hefei Kejing supports non-standard diameters between 5 mm and 100 mm with minimum order quantity (MOQ) of 50 pieces per dimension.
Do you provide SEM/EDS characterization reports for each lot?
Upon request and with advance notice, full microstructural characterization—including cross-sectional SEM imaging and quantitative EDS elemental mapping—is available at no additional cost for orders ≥200 units.
Is long-term storage stability documented?
Accelerated aging tests per ICH Q1A(R2) confirm no measurable oxidation or mass loss after 24 months when stored desiccated at 25°C in original sealed packaging.
