A device and a method for detecting an analyte in a liquid sample. In an aspect, a mixing portion is configured to receive and mix a first liquid solution of unknown composition with a second liquid solution that includes a suspended particle resulting in a mixed liquid solution, wherein a surface of the suspended particle is functionalized to target an analyte. Furthermore, in an aspect, a surface of a solid substrate is configured to receive and evaporate a drop of the mixed liquid solution, wherein evaporation of the drop in connection with a capillary flow of the mixed liquid solution disperses the suspended particle in a ring pattern. The presence or absence of an analyte in the first liquid solution can be determined by visual inspection of the ring pattern.