title: Novel MEMS-based gas-cell/heating specimen holder provides advanced imaging capabilities for in situ reaction studies.
abstract: In prior research, specimen holders that employ a novel MEMS-based heating technology (Aduro™) provided by Protochips Inc. (Raleigh, NC, USA) have been shown to permit sub-Ångström imaging at elevated temperatures up to 1,000°C during in situ heating experiments in modern aberration-corrected electron microscopes. The Aduro heating devices permit precise control of temperature and have the unique feature of providing both heating and cooling rates of 10⁶°C/s. In the present work, we describe the recent development of a new specimen holder that incorporates the Aduro heating device into a "closed-cell" configuration, designed to function within the narrow (2 mm) objective lens pole piece gap of an aberration-corrected JEOL 2200FS STEM/TEM, and capable of exposing specimens to gases at pressures up to 1 atm. We show the early results of tests of this specimen holder demonstrating imaging at elevated temperatures and at pressures up to a full atmosphere, while retaining the atomic resolution performance of the microscope in high-angle annular dark-field and bright-field imaging modes.
authors: Physical Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA. allardLFjr@ornl.gov
authors: Lawrence F
authors: LF
authors: Allard
authors: Steven H
authors: SH
authors: Overbury
authors: Wilbur C
authors: WC
authors: Bigelow
authors: Michael B
authors: MB
authors: Katz
authors: David P
authors: DP
authors: Nackashi
authors: John
authors: J
authors: Damiano