Figure 7
Three STM images obtained consecutively at the same location, which show that a change of tunneling bias or scan direction can erase the DHPA double-chain structure.
The meandering DHPA chains in (a) are partially erased in (b) and about halfway through erased in (c), revealing some intact gold herringbone structures originally under the DHPA chains. Scanning conditions: (a) U = 0.9 V, I = 100 pA, T = 141 K; (b) U = −0.8 V, I = 500 pA, T = 141 K; (c) U = −0.8 V, I = 500 pA, T = 141 K.
