ShanghaiTech University ultra-high vacuum TPD system put into use

In May 2020, the ultra-high vacuum temperature programmed desorption (TPD) system designed and built by Fermion Instruments was installed at the School of Materials Science and Engineering of ShanghaiTech University and handed over to users for use.

▲On-site photo of TPD system

The TPD test pre-adsorbs special gas molecules on the sample, and then observes the desorption process of the adsorbed gas through program heating and analysis. It plays a very important role in the research of energy catalytic materials. The system includes key modules such as ultra-high vacuum system, precise and fast temperature control module and mass spectrometer.

The ultra-high vacuum TPD system of Fermion Instruments is mainly composed of three parts: fast sampling system, sample preparation system, and ultra-high vacuum analysis system.

01  Fast sampling system

The fast sampling system is connected to the atmosphere and the sample preparation chamber respectively to achieve fast sample placement and transfer between the fast sampling chamber and the sample preparation chamber;

02  Sample preparation system

The sample preparation system is equipped with a high-precision, high-strength four-axis high-temperature sample holder independently developed by Fermion, which can stably heat the sample to 1500K, and is equipped with an ion source, low-energy electron diffractometer, QCM, etc., to achieve surface treatment, material growth monitoring and other functions;

03  Ultra-high vacuum analysis system

The ultra-high vacuum analysis system is equipped with a high-precision, high-strength four-axis variable temperature sample holder with a wide operating temperature range from 90K to 1500K, and supports software-controlled rapid linear temperature rise and fall. At the same time, the analysis chamber is also equipped with a mass spectrometer, a five-way gas washing system, etc., which can perform precise analysis.

▲TPD sample stage

▲Linear temperature control curve of TPD test

Compared with the conventional TPD system where sample preparation and analysis equipment are independent of each other, this ultra-high vacuum TPD system can achieve rapid sample switching, avoid uncertainties in the sample transportation process, effectively improve experimental efficiency, and obtain more accurate results.