Quartz Crystal Microbalance (QCM) Crystal Library – A-Z Series by Hefei Kejing

Overview

The A-Z Series Quartz Crystal Microbalance (QCM) Crystal Library is a comprehensive, systematically organized collection of high-purity, single-crystal and polycrystalline substrates engineered for precise mass-sensitive detection in vacuum, liquid-phase, and electrochemical environments. Built upon the fundamental principle of piezoelectric resonance—where frequency shift (Δf) correlates linearly with nanogram-level mass change (Δm) via the Sauerbrey equation—the A-Z Series enables quantitative, real-time monitoring of thin-film deposition, molecular adsorption, interfacial reactions, and viscoelastic property evolution. Each crystal is fabricated to strict orientation tolerances (typically ±0.5° off-axis), polished to optical-grade surface roughness (<0.3 nm RMS), and rigorously tested for resonant frequency stability (±50 ppm over 24 h at 25 °C). Designed for integration with standard QCM-D systems (e.g., Q-Sense, Biolin Scientific, Stanford Research Systems), these crystals serve as foundational reference materials in surface science, corrosion studies, biosensor development, and thin-film process control.

Key Features

• Extensive material coverage spanning 120+ substrates across oxide, chalcogenide, fluoride, nitride, semiconductor, and metal categories
• Crystallographically defined orientations: Ti-terminated SrTiO₃, (001)-oriented MgO, (100)-Si, (0001)-SiC (4H/6H), and R-cut LiNbO₃ for reproducible epitaxial growth
• Surface finish options: Optical polish (Ra < 0.3 nm), chemical-mechanical polish (CMP), and conductive metallization (Au, Pt, Cr/Au bilayer) available on request
• Dimensional consistency: Standard 14 mm diameter × 0.167 mm thickness (5 MHz fundamental mode), with custom thicknesses (1–10 MHz range) and diameters (8–25 mm) supported
• Traceable certification: Each batch includes XRD phase verification, AFM surface topography report, and piezoelectric coefficient (d₁₁) validation per IEC 60444-4

Sample Compatibility & Compliance

The A-Z Series supports compatibility with ISO/IEC 17025-accredited QCM platforms and conforms to ASTM E2592–19 (Standard Practice for QCM-Based Thin-Film Thickness Measurement). Substrates such as Al₂O₃, SiO₂, and Ta₂O₅ meet USP endotoxin testing requirements when used in biocompatibility assay configurations. Crystals with low dielectric loss (e.g., LaAlO₃, LSAT, GGG) are qualified for cryogenic QCM operation down to 4 K. All metallic substrates (Au, Ag, Ni, Cu) undergo ASTM B571 adhesion testing; oxide and fluoride wafers comply with SEMI F1–0218 for particle count (<10 particles/cm² ≥0.5 µm). Documentation includes RoHS 2015/863 and REACH SVHC declarations.

Software & Data Management

Crystals are fully compatible with industry-standard QCM data acquisition software including QTools (Q-Sense), QCM-I Control (Biolin), and LabVIEW-based custom DAQ frameworks. Frequency response logs (f₀, Δf, ΔD) can be exported in CSV, HDF5, or MATLAB .mat formats. When deployed in GLP/GMP-regulated environments, traceability is maintained through embedded lot IDs linked to LIMS-compatible metadata (crystal ID, polishing date, XRD scan ID, calibration certificate number). Audit trails for calibration history and usage cycles adhere to FDA 21 CFR Part 11 requirements when integrated with validated electronic lab notebooks (ELNs).

Applications

• Atomic layer deposition (ALD) process optimization using AlN, HfO₂, and ZnO substrates
• Electrochemical QCM (EQCM) studies of ion intercalation in LiCoO₂, NMC, and solid-state electrolyte interfaces
• Biospecific binding kinetics on functionalized Au- and SiO₂-coated crystals (e.g., anti-IgG immobilization, DNA hybridization)
• Corrosion inhibitor film formation monitoring on Fe:SrTiO₃ and stainless-steel-coated quartz
• 2D material transfer and strain mapping on graphene, MoS₂, and BP (black phosphorus) monolayers
• High-temperature QCM sensing up to 400 °C using SiC, Al₂O₃, and YSZ substrates

FAQ

Are all crystals in the A-Z Series pre-mounted on standard QCM holders?
No—crystals are supplied bare (unmounted) unless specified. Mounting kits (gold-plated brass electrodes, PTFE gaskets, compression springs) are available separately under part code QCM-MK-AZ.
Do you provide orientation verification reports for each crystal?
Yes—X-ray diffraction (θ–2θ scan) and Laue back-reflection patterns are included for every lot. Reports specify Miller indices, full-width-at-half-maximum (FWHM), and mosaic spread.
Can I order custom-cut crystals with non-standard dimensions or orientations?
Yes—custom fabrication is supported under NDA. Minimum order quantity is 5 units per specification; lead time is 6–8 weeks from drawing approval.
What is the shelf life and storage recommendation?
Uncoated crystals retain performance for ≥24 months when stored desiccated at 20–25 °C. Metallized crystals require nitrogen-purged packaging and should be used within 12 months.
Is there batch-to-batch frequency repeatability data available?
Yes—statistical process control (SPC) charts showing f₀ distribution (CpK ≥1.33) and aging drift (≤20 ppm/month) are provided upon request for any ordered material group.