SECM- Negative W F eeabac k R ◆ If sample insulator, we get negative feedback < ◆ Diffusion is hindered R、0 00 Insulator Sampl
SECM - Negative Feedback If sample insulator, we get negative feedback i < iss Diffusion is hindered Insulator Sample C W R R O O O O
SECM-Operation Constant height mode tip scanned across substrate, current monitored ◆ In situ can be done in moist air
SECM - Operation Constant height mode tip scanned across substrate, current monitored In situ can be done in moist air
SECM-Applications ◆ Analysis ◆ Imaging ◆ Nanolithography ◆ high precision high accuracy
SECM - Applications Analysis Imaging Nanolithography high precision high accuracy
SECM: Reviews +RCEngstrom, C M. Pharr Anal Chem.1989.6l.1099A-1104A .A. Bard G. denuault clee D. Mandler, D.O. Wipf Acc Chem.Res.1990.23.357-363. .M. Mirkin anal. chem. 1996 96.177A-182A
SECM: Reviews R.C.Engstrom, C.M.Pharr Anal. Chem. 1989, 61, 1099A-1104A. A.J.Bard, G.Denuault, C.Lee, D.Mandler, D.O.Wipf Acc. Chem. Res. 1990, 23, 357-363. M.V.Mirkin Anal. Chem. 1996, 96, 177A-182A
Electrochemical Quartz Crystal Microbalances (EQCM) Very sensitive mass sensors ◆ submonolayer aff ◆ Design electrode +2 electrodes sandwiching quartz Quartz crystal (piezoelectric) electrode ◆ oscillating E⊥ surface of quartz wafer oscillation at characteristic frequency (2-20MHz)
Electrochemical Quartz Crystal Microbalances (EQCM) Very sensitive mass sensors submonolayer Design: 2 electrodes sandwiching quartz (piezoelectric) oscillating E ⊥ surface of quartz wafer oscillation at characteristic frequency (2 - 20 MHz) electrode electrode Quartz crystal stuff