Tao Feng, Tang David, Salmeron Miquel, Somorjai Gabor A
Materials Science and Chemistry Divisions, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
Rev Sci Instrum. 2008 Aug;79(8):084101. doi: 10.1063/1.2960569.
We present the design and performance of a homebuilt high-pressure and high-temperature reactor equipped with a high-resolution scanning tunneling microscope (STM) for catalytic studies. In this design, the STM body, sample, and tip are placed in a small high pressure reactor ( approximately 19 cm(3)) located within an ultrahigh vacuum (UHV) chamber. A sealable port on the wall of the reactor separates the high pressure environment in the reactor from the vacuum environment of the STM chamber and permits sample transfer and tip change in UHV. A combination of a sample transfer arm, wobble stick, and sample load-lock system allows fast transfer of samples and tips between the preparation chamber, high pressure reactor, and ambient environment. This STM reactor can work as a batch or flowing reactor at a pressure range of 10(-13) to several bars and a temperature range of 300-700 K. Experiments performed on two samples both in vacuum and in high pressure conditions demonstrate the capability of in situ investigations of heterogeneous catalysis and surface chemistry at atomic resolution at a wide pressure range from UHV to a pressure higher than 1 atm.
我们展示了一种自行搭建的、配备高分辨率扫描隧道显微镜（STM）用于催化研究的高温高压反应器的设计与性能。在这种设计中，STM主体、样品和探针置于超高真空（UHV）腔室内的一个小型高压反应器（约19 cm³）中。反应器壁上的一个可密封端口将反应器内的高压环境与STM腔室的真空环境分隔开，并允许在超高真空条件下进行样品转移和探针更换。样品转移臂、摆动棒和样品加载锁定系统相结合，可实现样品和探针在制备腔室、高压反应器及周围环境之间的快速转移。该STM反应器可在10⁻¹³至几个巴的压力范围以及300 - 700 K的温度范围内作为间歇式或流动式反应器工作。在真空和高压条件下对两个样品进行的实验表明，该反应器能够在从超高真空到高于1个大气压的宽压力范围内，以原子分辨率对多相催化和表面化学进行原位研究。
