Chiral polyaniline doped with d-camphorsulfonic acid (d-CSA) (PANI-(d-CSA)) was synthesized by in situ polymerization in the presence of a constant magnetic field (0.4 T). The micromorphology, conductivity, and electromagnetic properties of chiral polyaniline were systematically investigated using scanning electron microscopy, electrochemical workstation, four-point probe conductivity measurements, and a vector network analyzer. The results showed that when compared with PANI-(d-CSA)-O synthesized in the absence of a magnetic field, PANI-(d-CSA)-M synthesized in the presence of a magnetic field had increased length–diameter ratio, higher conductivity, and stronger electromagnetic loss property. The minimum reflectivity of PANI-(d-CSA)-M reduced by 21.78% and the bandwidth of microwave absorption (reflection loss < −10 dB) of PANI-(d-CSA)-M increased 4.7 times.
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