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<p>High-performance porous copper (Cu)-based electrochemical sensors could potentially be achieved using GHz-burst femtosecond laser sintering, which allows enhanced control over the oxidation state and surface area. In this study, porous Cu-based electrodes were fabricated by GHz-burst femtosecond laser sintering and their electrochemical performances were evaluated in the non-enzymatic detection of D-glucose. Electrodes were produced under different intra-pulse numbers (<i>N</i><sub>int</sub> = 1, 2, 5, and 10), allowing control over both the extent of oxidation and the phase composition. At higher intra-pulse numbers, oxidation was effectively suppressed because of the reduced pulse intensity, whereas lower intra-pulse numbers promoted copper(I) oxide (Cu<sub>2</sub>O) formation through excessive heating. Electrochemical studies revealed that the Cu<sub>2</sub>O-containing electrode fabricated in the non-burst mode (<i>N</i><sub>int</sub> = 1) exhibited superior catalytic activity, demonstrating enhanced sensitivity toward D-glucose compared with that achieved using Cu-rich electrodes. These results confirm that GHz-burst femtosecond laser sintering provides precise control over the Cu phases and porosity, offering a promising strategy for developing efficient non-enzymatic glucose sensors.</p>

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Copper-based electrodes fabricated by GHz-burst femtosecond laser sintering of copper powders for non-enzymatic D-glucose detection

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年5月13日

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  • Taiga Sasahara,
  • Takayuki Tamaki,
  • Koshiro Nakayama,
  • Yudai Uchiyama,
  • Mizue Mizoshiri

摘要

High-performance porous copper (Cu)-based electrochemical sensors could potentially be achieved using GHz-burst femtosecond laser sintering, which allows enhanced control over the oxidation state and surface area. In this study, porous Cu-based electrodes were fabricated by GHz-burst femtosecond laser sintering and their electrochemical performances were evaluated in the non-enzymatic detection of D-glucose. Electrodes were produced under different intra-pulse numbers (Nint = 1, 2, 5, and 10), allowing control over both the extent of oxidation and the phase composition. At higher intra-pulse numbers, oxidation was effectively suppressed because of the reduced pulse intensity, whereas lower intra-pulse numbers promoted copper(I) oxide (Cu2O) formation through excessive heating. Electrochemical studies revealed that the Cu2O-containing electrode fabricated in the non-burst mode (Nint = 1) exhibited superior catalytic activity, demonstrating enhanced sensitivity toward D-glucose compared with that achieved using Cu-rich electrodes. These results confirm that GHz-burst femtosecond laser sintering provides precise control over the Cu phases and porosity, offering a promising strategy for developing efficient non-enzymatic glucose sensors.