Fig. 3: STM images of FBI and FBI derivative molecules on Au(111). | Nature Communications

Fig. 3: STM images of FBI and FBI derivative molecules on Au(111).

From: Ba+2 ion trapping using organic submonolayer for ultra-low background neutrinoless double beta detector

Fig. 3: STM images of FBI and FBI derivative molecules on Au(111).

a Large-scale STM image (50 × 50 nm2) of around 0.4 ML of FBI molecules deposited on Au(111) surface and measured at 4 K. Red squares show isolated molecules. Inset: constant current zoom STM image of a FBI molecule (I = 60 pA / U = 1.4 V) deposited on Au(111). b–d Bond-resolved STM images measured with a CO-functionalized probe (constant height, U = 5 mV) of individual FBI molecules: b benzo[a]imidazo[5,1,2-cd]indolizine fluorophore with phenyl ring and aza-crown ether (exactly the same molecule shown in the inset in a); c benzo[a]imidazo[5,1,2-cd]indolizine fluorophore; d benzo[a]imidazo[5,1,2-cd]indolizine fluorophore with phenyl ring but without the crown ether. For clarity, the same image is shown twice, top one with and bottom one without the molecular model superimposed to guide the eyes.

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