This study focuses on the multi-phasic iron oxide nanorods (IONRs) and evaluates their performance as photodetectors operational in broad spectrum ranging from UV to visible light. The IONRs were synthesized using a wet chemical co-precipitation (COP) method under varying reaction conditions that resulted in multi-phases of iron oxide. While sample labeled as COP1 consisted of mixed phases of α-FeOOH/α-Fe2O3/γ-FeOOH, the one labeled as COP2 showed ε-Fe2O3/γ-Fe2O3. Optical studies confirmed distinct energy bandgaps for IONRs samples. Transmission Electron Microscopy (TEM) showed a reduction in nanorod length from 60 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14373_Article_IEq1.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">$\pm$</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation> 8 (COP1) to 14 <InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14373_Article_IEq2.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">$\pm$</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation> 3 nm (COP2) and diameter from 5 <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14373_Article_IEq3.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">$\pm$</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation> 0.5 nm to 3 <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="10854_2025_14373_Article_IEq4.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="19" /> </InlineMediaObject> <EquationSource Format="TEX">$\pm$</EquationSource> <EquationSource Format="MATHML"><math> <mo>±</mo> </math></EquationSource> </InlineEquation> 0.5 nm. As-synthesized powder was cast as thin film on the screen-printed electrodes to measure photocurrent under UV and visible light illumination. Both the samples exhibited quick photoresponse under UV light illumination at a low bias voltage of 0.5 V, whereas the COP2 sample responded to visible light also. The synthesis of multi-phasic IONRs via a modified wet chemical method adds a versatile approach for altering their properties for enhanced photodetection applications and broadening the detection range.

Phase-dependent broad-range photodetection by iron oxide nanorods

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发表日期：

2025年2月17日

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Vrushali E. Kalokhe,
Abha Mahajan,
Sanju Rani,
Rupali Nagar

摘要

This study focuses on the multi-phasic iron oxide nanorods (IONRs) and evaluates their performance as photodetectors operational in broad spectrum ranging from UV to visible light. The IONRs were synthesized using a wet chemical co-precipitation (COP) method under varying reaction conditions that resulted in multi-phases of iron oxide. While sample labeled as COP1 consisted of mixed phases of α-FeOOH/α-Fe₂O₃/γ-FeOOH, the one labeled as COP2 showed ε-Fe₂O₃/γ-Fe₂O₃. Optical studies confirmed distinct energy bandgaps for IONRs samples. Transmission Electron Microscopy (TEM) showed a reduction in nanorod length from 60 $\pm$ $\pm$ 8 (COP1) to 14 $\pm$ $\pm$ 3 nm (COP2) and diameter from 5 $\pm$ $\pm$ 0.5 nm to 3 $\pm$ $\pm$ 0.5 nm. As-synthesized powder was cast as thin film on the screen-printed electrodes to measure photocurrent under UV and visible light illumination. Both the samples exhibited quick photoresponse under UV light illumination at a low bias voltage of 0.5 V, whereas the COP2 sample responded to visible light also. The synthesis of multi-phasic IONRs via a modified wet chemical method adds a versatile approach for altering their properties for enhanced photodetection applications and broadening the detection range.