SURFACE-CHARGE MAPPING OF SOLID-SURFACES IN WATER BY PULSED-FORCE-MODE ATOMIC-FORCE MICROSCOPY

We have studied the lateral distribution of charges on various surface s in water by measuring the electrical double layer forces between a S i3N4 atomic force microscope (AFM) tip and the surfaces. By increasing the pH of the solution around the isoelectric point (IEP) of Si3N4 of approximately 6, the charge on the Si3N4 AFM tip was changed from pos itive to negative. The surface charges of the samples were also contro lled by the pH of the solution in which the sample oxides were dipped. When the samples were electronically conductive, the surface charge w as controlled by the electrode potentials. When the sample surface was heterogeneous in terms of the isoelectric point or point of zero char ge (pzc), the surface charge was changed from one place to the other. As a heterogeneous oxide sample, a quartz plate patterned with alumina was used. The lateral charge distributions on such surfaces were mapp ed by pulsed-force-mode AFM. The lateral resolution of the present met hod was found to be approximately 20 nm.