Influence of surface state on the optical absorption of isolated nanoscale silver particles

The measurement of optical absorption was made on the nanoscale silver particles dispersed in silicon oil and silicon oil with added dressing agent. An absorption peak appears in the nanoscale silver particles dispersed in silicon oil, but the absorption peak disappears when the dressing agent is added. The interaction between external molecules and the surface of small silver particles seems to have strong influence on the absorption peak of small silver particles.