Abstract
We report a simple, in-expensive, portable, and ultrasensitive optical sensor for detection of ammonia in parts per million levels using magnetic nanofluids. The sensor produces visually perceptible color changes, in the presence of ammonia, due to the changes in the lattice periodicity of 1-dimensional array of droplets. The penetration of ammonia into the diffused electric double layer around the emulsion droplet causes significant blue shift in the diffracted Bragg peak. The mechanism of the blue shift is probed by measuring the subtle changes in the intermolecular forces in the presence of ammonia. The present approach is useful for online monitoring of ammonia.
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