Silver Foil for Quartz Crystal Microbalance (QCM) Electrodes – Hefei Kejing Model Ag-Foil

Overview

Silver foil (Ag-foil) is a high-purity, ultra-thin metallic substrate engineered for use as an electrode material in quartz crystal microbalance (QCM) systems. As a fundamental component in electrochemical QCM (EQCM) configurations, Ag foil serves as both a conductive working electrode and a mass-sensitive transducing surface. Its well-defined crystallinity, low intrinsic stress, and excellent adhesion to AT-cut quartz substrates enable reproducible deposition of functional layers—including self-assembled monolayers (SAMs), polymer films, biomolecular recognition elements, and catalytic nanostructures—while maintaining the piezoelectric integrity of the resonator. This foil is not a standalone instrument but a critical consumable engineered for integration into ISO/IEC 17025-compliant electrochemical characterization workflows where trace-level mass change detection (< 0.1 ng/cm²) and real-time monitoring of interfacial processes are required.

Key Features

• High-purity silver (≥99.99% Ag, trace metals <1 ppm) certified by ICP-MS analysis
• Precisely controlled thickness tolerance: ±5% across 0.01 mm to 1.0 mm range, with surface roughness (Ra) <20 nm (measured by AFM)
• Electro-polished finish ensuring uniform current distribution and minimal Faradaic background in potentiodynamic measurements
• Customizable geometry: circular discs (Ø3–25 mm), rectangular strips (up to 50 × 10 mm), or patterned electrodes via photolithographic etching upon request
• Controlled oxide layer: native Ag₂O thickness stabilized at ≤1.2 nm (XPS-verified) to ensure consistent electron transfer kinetics
• Traceable lot documentation including certificate of conformance (CoC), residual gas analysis (RGA) report, and particulate count log (per ISO 14644-1 Class 5 equivalent)

Sample Compatibility & Compliance

This Ag foil is validated for compatibility with standard 5–10 MHz AT-cut quartz crystals (e.g., Maxtek QCM-D series, Stanford Research Systems QCM200, and INFICON XTM/2). It adheres to ASTM E2481–22 “Standard Practice for Calibration of Quartz Crystal Microbalances Used in Thin-Film Deposition” for baseline frequency stability (<±0.5 Hz drift over 1 h under N₂ purge). The vacuum-sealed Class 100 packaging ensures compliance with USP Analytical Instrument Qualification guidelines for pre-use verification of particulate and organic contamination. While not classified as a medical device, its manufacturing process follows ISO 9001:2015 and ISO 14001:2015 frameworks; documentation supports GLP audit readiness for pharmaceutical thin-film dissolution studies and battery SEI layer research.

Software & Data Management

As a passive consumable, the Ag foil itself does not interface with software. However, it is fully compatible with industry-standard EQCM data acquisition platforms—including NOVA (Metrohm Autolab), EC-Lab (BioLogic), and Gamry Framework—enabling synchronized acquisition of frequency shift (Δf), dissipation (ΔD), current (i), and potential (E) signals. When used with QCM-D instruments, the foil supports full viscoelastic modeling (Sauerbrey + Voigt-based fitting) in accompanying software (QSense Dfind, QTools). All lot-specific material certificates are digitally archived and retrievable via Hefei Kejing’s secure customer portal, supporting 21 CFR Part 11-compliant electronic record retention when integrated into validated laboratory information management systems (LIMS).

Applications

• In-situ monitoring of silver electrodeposition/dissolution kinetics in battery electrolyte screening (Li–S, Zn–AgO)
• Real-time binding affinity quantification of thiolated DNA/aptamers on Ag surfaces for biosensor development
• Corrosion inhibition studies of Ag-coated Cu substrates under simulated industrial cooling water conditions (ASTM G102)
• Template-assisted growth of Ag nanowires for flexible transparent conductors
• Reference electrode fabrication in dual-QCM differential measurement cells for redox polymer film swelling analysis
• Surface-enhanced Raman spectroscopy (SERS) substrate preparation when combined with controlled roughening protocols

FAQ

Is this silver foil suitable for high-temperature QCM applications (>150 °C)?
No. Standard Ag foil softens above 120 °C and exhibits accelerated grain boundary diffusion. For elevated-temperature operation, we recommend Au-coated or Pt-sputtered alternatives.
Can I order Ag foil pre-deposited onto a quartz crystal?
Yes. Hefei Kejing offers OEM-ready QCM blanks with e-beam evaporated Ag electrodes (50–200 nm thick) and optional Cr adhesion layers. Lead time: 4–6 weeks.
What cleaning protocol do you recommend prior to use?
We advise sequential ultrasonication in acetone (5 min), isopropanol (5 min), and deionized water (5 min), followed by O₂ plasma treatment (50 W, 60 s) to remove hydrocarbons without oxidizing the surface.
Do you provide ISO/IEC 17025-accredited calibration reports?
No—calibration applies to instruments, not consumables. However, each lot includes traceable thickness metrology (certified by NIST-traceable profilometry) and purity verification per ISO 17034.
Is this product compliant with RoHS and REACH regulations?
Yes. Full substance declaration and SVHC screening documentation are provided with every shipment per EU Regulation (EC) No 1907/2006.