Mechanical and optical manipulation of porphyrin rings at the submicrometre scale

Abstract

Scanning probe microscopes (SPMs) and especially the atomic force microscope (AFM) can be used as tools for modifying surface structures on the submicrometre and even nanometre scale. For this purpose an advanced interface has been developed to facilitate these manipulations and greatly increase the number of possible applications. In this paper this interface (the nanoManipulator, developed at the University of North Carolina at Chapel Hill) is implemented on a combined AFM-confocal microscope. This setup allows AFM imaging, manipulations and fluorescence imaging of the same area on the sample.The new setup is tested on ringlike structures of a porphyrin derivative (BP6). A small amount of the fluorescent material could be displaced with the AFM tip. A special tool (sweep mode) allowed a modification of around 130 nm, which was afterwards detectable with the confocal microscope. The resolution attainable in these kind of experiments could go down below 100 nm and is primarily determined by the tip and sample geometry.Comparable with this experiment is the application of a near-field scanning optical microscope (NSOM) to make photochemical modifications. Using the excitation power coming from the NSOM probe the fluorescence can be quenched by bleaching a selected area instead of displacing the material. Application on the BP6 rings led to a modification of 280 nm wide.AFM can perform modifications on a smaller scale but is less selective than NSOM. Optical investigation of the changes after AFM manipulation can give more elaborate information on the modifications. This will extend the possible applications of the techniques and may ultimately go down to the single-molecule level.

Combined AFM and confocal fluorescence microscope for applications in bio‐nanotechnology

“…Several examples of AFM and fluorescence microscope combinations have been reported in the literature over the last few years (Lieberman et al ., 1996; Lal & Proksch, 1997; Foubert et al ., 2000; Horton et al ., 2000; Kolodny et al ., 2001; Noy & Huser, 2003; Gradinaru et al ., 2004). One of the most significant problems in these designs is the optical background in the fluorescence detection caused by the laser used in the AFM to detect the cantilever position (Meyer & Amer, 1988).…”

Comparative study of plasma-treated non-precious catalysts for oxygen and hydrogen peroxide reduction reactions

“…The formation of ring-like self-assemblies of porphyrin molecules is well described in the literature. [62][63][64] The rings formed by FeTPFPPCl (Cat-3) were approximately 55 nm in height. The rings diameter distribution was bimodal with peaks at 0.3 and 1.0 mm.…”

Nanometer space resolved photochemistry

“…This manipulation was carried out by implementing an interface, called the nanoManipulator, on a combined AFM-confocal microscope. 28 A small amount of the fluorescent material from the ring could be displaced with the AFM tip. A special tool (sweep mode), in which the AFM tip is moved very fast perpendicular to the direction of the desired manipulation which creates a virtually broader tip, allowed a modification of 130 nm (Fig.…”