# Presentation: 574962

## Slide 1

**Notes:**
The PEEM images of Fig. 1 were taken in situ at different times during growth.  At the growth temperature of 600 C the wire density is very low and it is therefore necessary to step around the surface and look for a growing nanowire.  It is a very rare occurrence to find one initially in the field of view at 600 C.  The nanowire shown in Fig 1 was first imaged 16 minutes after growth had commenced.  The times for Fig. 1 are (a) 16 minutes, (b) 22 minutes, and (c) 31 minutes.

The nanowires are stable for a few days in air and can be transferred out of the UHV PEEM chamber in which they’re grown for imaging ex situ with SEM.  The SEM image of Fig. 2 shows nanowires and compact islands grown at 500 C.  The number density of both nanowires and compact islands is higher at lower temperatures.

The further technological ramification of our research is that pre-step modification of the surface in specific places (via lithography, for example), followed by the self-assembling growth we have demonstrated, will allow the specific positioning of nanowires of any desired length on silicon substrates, a very desirable capability for nanoelectronic device engineering.

## During the summer 2006 eight Bradley University undergraduate physics students participated in this research program mentored by one of the collaborating faculty members supported by the project.  Each of these students became proficient at operation of one of the ultra-high vacuum systems in our research group and the associated surface analytical instrumentation.  By the end of the ten week summer research period each student group was able to undertake independently the entire process of sample preparation; sample mounting in UHV; system bakeout; data acquisition;  and data analysis.  The students had the opportunity for "hands on" experience with a variety of instrumentation including:  variable temperature UHV scanning tunneling microscope; X-ray and ultra-violet photoelectron spectroscopy; high resolution energy loss spectroscopy; Auger electron spectroscopy;  and time-of flight surface mass spectroscopy.  During the past year four students have served as presenters at two national meetings- AVS International Symposium in Boston, MA and "Surface Analysis 2006" in Albuquerque, NM.  Two undergraduate students have co-authored two publications resulting from work on this NSF project.  As a result of these opportunities the participating students have developed impressive research skills far in excess of that which would have been possible from purely classroom activities.  Consequently, these students have developed rapidly as enthusiastic and passionate young scientists. 

- During the summer 2006 eight Bradley University undergraduate physics students participated in this research program mentored by one of the collaborating faculty members supported by the project.  Each of these students became proficient at operation of one of the ultra-high vacuum systems in our research group and the associated surface analytical instrumentation.  By the end of the ten week summer research period each student group was able to undertake independently the entire process of sample preparation; sample mounting in UHV; system bakeout; data acquisition;  and data analysis.  The students had the opportunity for "hands on" experience with a variety of instrumentation including:  variable temperature UHV scanning tunneling microscope; X-ray and ultra-violet photoelectron spectroscopy; high resolution energy loss spectroscopy; Auger electron spectroscopy;  and time-of flight surface mass spectroscopy.  During the past year four students have served as presenters at two national meetings- AVS International Symposium in Boston, MA and "Surface Analysis 2006" in Albuquerque, NM.  Two undergraduate students have co-authored two publications resulting from work on this NSF project.  As a result of these opportunities the participating students have developed impressive research skills far in excess of that which would have been possible from purely classroom activities.  Consequently, these students have developed rapidly as enthusiastic and passionate young scientists.

**Notes:**
Papers with undergraduate students as co-authors (*denotes undergraduate author):

"Adsorption and Decomposition of Triethylsilane on Si(100),"  J. Lozano, A. Brickman*, S. Yeninas*, D. Early, and J.H. Craig, Jr., Appl. Surface Sci., in press.

"Adsorption of Triethylgermane on Si(100):  Thermal and Non-thermal Channels for Ethyl Ligand Removal/Dissociation,"  A. Brickman*, S. Yeninas*, J. Lozano, and J.H. Craig, Jr., Surf. Interface Anal., in press.