<p>Graphene has attracted much attention in the field of photodetection because of its unique properties such as extremely high carrier mobility and wide-spectrum optical absorption. However, graphene’s poor optical absorption limits its application. In this paper, based on the localized surface plasmon resonance (LSPR) effect of gold nanoparticles (AuNPs) can effectively improve the optical absorption of graphene, we synthesized urchin-like gold nanoparticles with stronger LSPR and prepared gold nanoparticles/graphene (AuNPs/Gr) and graphene (Gr) two kinds of photoelectric detector (PD). AuNPs can produce strong LSPR effect under light to generate hot electrons, which can easily enter into the conduction band of Gr, enhancing the responsivity of graphene. At 365 nm wavelength 5 V bias, the photocurrent of the AuNPs/Gr PD is about 36.91 <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\mu A$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>μ</mi> <mi>A</mi> </mrow> </math></EquationSource> </InlineEquation>, which is 3.5 times higher than the 10.48 <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\mu A$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>μ</mi> <mi>A</mi> </mrow> </math></EquationSource> </InlineEquation> of the Gr PD. At 365 nm wavelength 1.05 <InlineEquation ID="IEq3"> <EquationSource Format="TEX">$\text{mW}/{\text{cm}}^{2}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>mW</mtext> <mo stretchy="false">/</mo> <msup> <mrow> <mtext>cm</mtext> </mrow> <mn>2</mn> </msup> </mrow> </math></EquationSource> </InlineEquation> incident optical power density, with the enhancement of urchin-like AuNPs, the responsivity of AuNPs/Gr PD was increased to 5.02 <InlineEquation ID="IEq4"> <EquationSource Format="TEX">$\text{mA}/\text{W}$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mtext>mA</mtext> <mo stretchy="false">/</mo> <mtext>W</mtext> </mrow> </math></EquationSource> </InlineEquation>, and the specific detectivity was increased to 1.71 × 10<sup>8</sup> Jones, which was more than eight times higher than the Gr PD. This work provides a simple method for enhancing PD performances using metal nanoparticles.</p>

Graphene Ultraviolet Photoconductive Detector Enhanced by Plasmon Local Field with Sea-Urchin-Like Gold Structure

期刊论文
发表日期：

2025年7月22日

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Guangchen Yin,
Kaixi Bi,
Miaoli Guo,
Cong Li,
Donghui Huang,
Hao Liu,
Longhao Liu,
Wenqi Xiong,
Jialiang Chen,
Huiqi Wang,
Linyu Mei

摘要

Graphene has attracted much attention in the field of photodetection because of its unique properties such as extremely high carrier mobility and wide-spectrum optical absorption. However, graphene’s poor optical absorption limits its application. In this paper, based on the localized surface plasmon resonance (LSPR) effect of gold nanoparticles (AuNPs) can effectively improve the optical absorption of graphene, we synthesized urchin-like gold nanoparticles with stronger LSPR and prepared gold nanoparticles/graphene (AuNPs/Gr) and graphene (Gr) two kinds of photoelectric detector (PD). AuNPs can produce strong LSPR effect under light to generate hot electrons, which can easily enter into the conduction band of Gr, enhancing the responsivity of graphene. At 365 nm wavelength 5 V bias, the photocurrent of the AuNPs/Gr PD is about 36.91 $\mu A$ $μ A$ , which is 3.5 times higher than the 10.48 $\mu A$ $μ A$ of the Gr PD. At 365 nm wavelength 1.05 $\text{mW}/{\text{cm}}^{2}$ $mW / {cm}^{2}$ incident optical power density, with the enhancement of urchin-like AuNPs, the responsivity of AuNPs/Gr PD was increased to 5.02 $\text{mA}/\text{W}$ $mA / W$ , and the specific detectivity was increased to 1.71 × 10⁸ Jones, which was more than eight times higher than the Gr PD. This work provides a simple method for enhancing PD performances using metal nanoparticles.