Project Description

Application of Electrochemical Quartz Crystal Microbalance

Electrochemical quartz crystal microbalance (EQCM) is the testing technique combining quartz crystal microbalance (QCM) with electrochemical testing. Electrochemical quartz crystal microbalance enables easy and quick dynamic testing on deposition, adsorption or dissolution of active substance on quartz crystal at nanogram level; thanks to these advantages, it becomes an effective tool for research on surface/interface reaction. Since EQCM testing technique is an in-situ testing method, it enables online real-time monitoring; thanks to its high accuracy and high sensitivity, it can further analyze the processes that occur on surface/interface and the in-depth mechanism. According to the principle of EQCM and Sauerbrey equation, the oscillation frequency of piezoelectric quartz crystal is very sensitive to the mass change on crystal surface, with sensitivity up to ng level; so it provides good conditions for EQCM to test chemical reaction process on electrode surface. Chemical reactions that occur on electrode surface are affected by multiple factors; with EQCM, it can dynamically test the synthesis process of polymer and the impacts of different factors in synthesis process, so as to get the best synthesis conditions.


How to choose quartz crystal monitor in the application of electrochemical quartz microbalance

In actual applications, test material must be evenly coated on electrode surface in order to get measuring results with good repeatablity and reproduciblity. Quartz crystal is important prerequisite to ensure its sensitivity; there are three choices:

  • AT-CUT quartz crystal; the temperature coefficient for frequency of AT-cut quartz crystal is close to zero at room temperature; it can reduce the impact of temperature on experiment at room temperature.
  • Select quartz crystal with appropriate fundamental frequency; the higher the fundamental frequency of quartz crystal, the higher the measuring sensitivity ∆f/∆m; however, if fundamental frequency is too high, due to too small thickness and insufficient strength, it is very prone to damage, thus bringing great challenge to manufacturing and use.
  • Select quartz crystal with highly stable frequency; generally, the shift of quartz crystal frequency should not be greater than 1 Hz.

During measurement, it is necessary to strictly control ambient conditions; the measurement must be performed in vacuum or inert atmosphere to avoid interfering measuring results.

In case of the specimen that cannot be evenly coated, you can make use of the top part of sensitivity distribution curve of quartz crystal microbalance, and add small amount of specimen to the center of quartz resonator electrode for multiple times, so as to reduce distribution area and to get satisfactory measuring results.


Why should you choose Manufacturers custom Analytical chemistry QCM sensors

QCM chip is the most critical component in a QCM device; the associated chips from most device manufacturers are not interchangeable; currently, they are mainly supplied as associated components from device manufacturers. Globally, because the market is small and relevant enterprises are not many, the enterprises that are specialized in/dedicated to crystal chips are even fewer; in most cases, the brand owners purchase/resell them from OEM/ODM manufacturers; SungThai is one of a few specialized ODM/OEM manufacturers; thanks to specialized manufacturing for thirty years, SungThai can develop customized products for customers; nowadays, SungThai is in leading position in China and even in the world.

Our product team has a history of manufacturing QCM sensors for nearly 30 years; with same manufacturing system, we manufacture crystal components for the devices of aviation/aerospace grade. Our product manufacturing system integrates the high requirements for military and aviation applications; longevity, stability, accuracy and anti-interference are the intrinsic gene of our products.

The price of our products is very competitive; because you directly purchase products from our factory, standard products can be delivered from the inventory or in shortest time. In case of customized products, we can provide competitive lead time for you.

All of our products are packaged in Class 1000 secondary clean room, with vacuum sealing; it ensures that the products are not contaminated in the process of delivery to you, and maintain as high quality as discharged from the production line. In addition, it can provide longer storage time for you.

High-end piano allows for better performance; but a person without long-term special training cannot make excellent products no matter what high-end machines he uses. Our engineers are our core competency; thanks to expertise accumulated for 30 years, our engineers can make use of modern equipment, manufacturing system and excellent technology to manufacture QCM sensors with superior quality.

A good-quality product depends on strict management on the process from raw materials to delivery of packaged products, rather than 100% testing before shipment. Just like an excellent school, its competency is built on the soft power of outstanding education system, rather than excellent physical facilities.
China’s important export countries of piezoelectric crystal, we are one of the industry standard setters


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  • Developer of Chinese industrial standard for crystals.

  • OEM/ODM manufacturing of crystal components for nearly 60 years