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<p>A highly sensitive and selective colorimetric sensor for cyanide ions was developed using di(hydrazinecarbonyl)oxacalix[4]arene (DHOC) functionalized silver nanoparticles (DHOC@AgNPs). In this approach, DHOC acts as both a reducing and capping agent, enabling the formation of stable and well-dispersed AgNPs with a characteristic surface plasmon resonance (SPR) band at 407&#xa0;nm. Upon exposure to cyanide ions, strong Ag-CN complexation induces nanoparticle etching and aggregation. This results in the disappearance of the SPR band and a distinct colour change from yellow to colourless. The sensor exhibits rapid response, excellent selectivity and a low limit of detection (LOD) of 1.43&#xa0;µM, determined using the standard 3σ/S method. Within the specified analytical range, a strong linear relationship between absorbance change and cyanide content was found. Additionally, the sensor showed dependable performance in actual water samples, demonstrating its usefulness. This straightforward and effective colorimetric platform offers a viable method for quick cyanide detection in aquatic environments.</p>

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Oxacalixarene appended silver nanoparticle for the colorimetric sensing of cyanide ion in aqueous medium

  • 期刊论文

  • 发表日期：

    2026年5月21日

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  • Janvi Patel,
  • Falak Panjwani,
  • Jinal Gajjar,
  • Kanaiyalal Patel,
  • Manoj Vora

摘要

A highly sensitive and selective colorimetric sensor for cyanide ions was developed using di(hydrazinecarbonyl)oxacalix[4]arene (DHOC) functionalized silver nanoparticles (DHOC@AgNPs). In this approach, DHOC acts as both a reducing and capping agent, enabling the formation of stable and well-dispersed AgNPs with a characteristic surface plasmon resonance (SPR) band at 407 nm. Upon exposure to cyanide ions, strong Ag-CN complexation induces nanoparticle etching and aggregation. This results in the disappearance of the SPR band and a distinct colour change from yellow to colourless. The sensor exhibits rapid response, excellent selectivity and a low limit of detection (LOD) of 1.43 µM, determined using the standard 3σ/S method. Within the specified analytical range, a strong linear relationship between absorbance change and cyanide content was found. Additionally, the sensor showed dependable performance in actual water samples, demonstrating its usefulness. This straightforward and effective colorimetric platform offers a viable method for quick cyanide detection in aquatic environments.