The CrxFe[Formula: see text]O4 ferrofluids have been successfully synthesized using natural iron sand through co-precipitation method as a voltage sensor. The use of chromium dopants is intended to increase the ferrofluids response when used as a voltage sensor. A series of characterizations were carried out to support this justification, including structure, morphology, functional groups, optical properties, and sensor performance of the CrxFe[Formula: see text]O4 ferrofluids. The increase in the Cr[Formula: see text] molar fraction has an impact on decreasing in structural parameters of the CrxFe[Formula: see text]O4 ferrofluids. Visually, the particles show an agglomeration phase by the presence of interparticle forces. The study of functional groups showed that the CrxFe[Formula: see text]O4 ferrofluids had been successfully formed, marked by the appearance of all precursor functional groups. Analysis of optical properties based on absorption shows the phenomenon of intervalence charge transfer and causes a decrease in the value of the gap energy. Interestingly, the CrxFe[Formula: see text]O4 ferrofluids sensor sensitivity shows a good and prospective response making them suitable for new sensor candidates in the future.
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