Image of the Month

Image of the Month
Posted Date: December 1, 2014
institution

Sequence (A−D) of STM images (100 nm × 100 nm) showing dynamic behavior of a decanethiolate SAM on the Au(111) at room temperature (293 K). The surface exhibits three ordered phases (β, δ, and χ*) and one disordered phase (ε). The solid line marks a domain boundary between the ordered β phase and the disordered ε phase, while the dashed line marks a χ*−ε domain boundary. The sample bias is 1.2 V and the tunnel current is 190 pA. The time lapse between consecutive images is 420 s. (E, F) Line profiles taken across the β and δ phases, respectively. The stripe widths are (E) 3.3 nm and (F) 2.2 nm.

Credits: Kai Sotthewes,†,§ Hairong Wu,†,‡,§ Avijit Kumar,† G. Julius Vancso,‡ Peter M. Schön,‡
and Harold J. W. Zandvliet*,†Physics of Interfaces and Nanomaterials and ‡Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands

Microscope: UHV 3000

Control System: SPM 1000

+Show More
Image of the Month
Posted Date: November 1, 2014
institution

PanScan Freedom Helium Free

Stability verification of RHK PanScan Freedom showing no influence of environmental or cryostat noise on the In doped Bi2Se3 atomic structure at 18 K (collected during the AVS 61st Exhibition)

institution

Performance verification of RHK PanScan Freedom showing exceptional performance, at the AVS 2014 Exhibition, on the Si(111) 7×7 atomic structure at 18 K

RHK is proud to highlight the outstanding performance of our PanScan Freedom at the AVS 61st International Symposium & Exhibition 2014.

The extreme stability of this microscope is demonstrated in the Baltimore Convention Center exhibition hall using an Indium doped Bismuth Selinide sample, showing both a high-level of isolation from the vibration of the Closed-Cycle Cryostat as well as the environment of the hall, yielding excellent performance with the noise level below 1 pm. The goal of a helium-free STM has been an elusive dream for the many researchers unable to secure a steady supply of affordable liquid helium.

Professor Miquel Salmeron said, “I was really impressed by your PanScan Freedom working so smoothly in the noisy environment of the AVS exhibit! The stability was superb and I loved immensely the closed circuit of He gas. This is so cool and so great at a time when getting liquid He is not an easy thing (not to speak of the cost). I wish I had money right now to buy one!”

RHK’s new helium-free PanScan Freedom enables every researcher to run their SPM at cryogenic temperatures endlessly without the trouble and expense of liquid helium.

Credits: Dr. Byoung Choi, RHK Technology

Microscope: RHK PanScan Freedom

Control System: RHK R9-STM and PMC100

+Show More
Image of the Month
Posted Date: October 1, 2014

Stability verification of RHK PanScan Freedom showing no influence of cryostat operation on the Si(111) 7×7 atomic structure

iotm-october-2014-1

Drift verification of RHK PanScan Freedom showing X,Y drift as low as 0.2Å/hour on the Si(111) 7×7 atomic structure at 18 K

RHK is proud to highlight the very low drift Si(111) 7×7 image acquired on our PanScan Freedom connected to a running Closed-Cycle Helium Cryostat.

The extreme stability of this microscope is demonstrated using a Si(111) 7×7 sample, showing both a high-level of isolation from the vibration of the Closed-Cycle Cryostat with the cryostat turned off in the lower half of the image and excellent drift performance as low as 0.2Å/hour.  A helium-free STM has been an elusive dream for the many researchers unable to secure a steady supply of affordable liquid helium.

RHK’s new helium-free PanScan Freedom enables every researcher to run their SPM at cryogenic temperatures, endlessly, without the trouble and expense of liquid helium.

Credits: Dr. Byoung Choi, RHK Technology

Microscope: RHK PanScan Freedom

Control System: RHK R9-STM and PMC100

+Show More
Image of the Month
Posted Date: August 1, 2013
institution

Atomically resolved STM images from the Pd (110)-Ic(2×2) phase together with atomic structure models. Atomic distances are 5.5 Å in (−110) and 4.8 Å in (−111). The long red arrow points along (−110).

institution

STM image of mixed the c(2×2) and q-hex phases.

Reference: J. Chem. Phys. 137, 204703 (2012); doi: 10.1063/1.4768165

Credits: Mats Göthelid, Michael Tymczenko, Winnie Chow, Sareh Ahmadi, Shun Yu, Benjamin Bruhn, Dunja Stoltz, Henrik von Schenck, Jonas Weissenrieder, and Chenghua Sun. – Materialfysik, ICT Electrum 229, Kungliga Tekniska Högskolan (KTH) and Australia Institute for Bioengineering and Nanotechnology, The University of Queensland

Microscope: RHK VT UHV STM/AFM Model UHV3500

Control System: RHK Technology SPM1000

Abstract: We use photoelectron spectroscopy, low energy electron diffraction, scanning tunneling microscopy, and density functional theory to investigate coverage dependent iodine structures on Pd(110). At 0.5 ML (monolayer), a c(2 × 2) structure is formed with iodine occupying the four-fold hollow site. At increasing coverage, the iodine layer compresses into a quasi-hexagonal structure at 2/3 ML, with iodine occupying both hollow and long bridge positions. There is a substantial difference in electronic structure between these two iodine sites, with a higher electron density on the bridge bonded iodine. In addition, numerous positively charged iodine near vacancies are found along the domain walls. These different electronic structures will have an impact on the chemical properties of these iodine atoms within the layer.

+Show More