In this study, a versatile sensing platform based on a commercially available filter paper for the development of a colorimetric sensor using label-free gold nanoparticles (AuNPs) for the detection of cyanide in water is presented. The developed sensor can be applied for the direct detection of cyanide from an aqueous sample efficiently in a wide concentration range. The synthesised AuNPs were found to have an average size of about 13.2 2.65 nm with a surface plasmon resonance peak at around 525 nm. Successful integration of AuNPs on the WFP substrate was observed through the FESEM-EDX analysis and supported by the presence of an absorbance peak at about 528 nm on the spectrum of the WFP-AuNPs composite. The colour of the WFP-AuNPs composite changed from purple-red to white in the presence of cyanide. Using the paper-based sensor, the limit of detection is calculated to be 7.68נ10⁻⁶ M (0.5 ppm). The said sensitivity is good enough for the determination of cyanide in industrial wastewater samples. The developed sensor also showed excellent selectivity towards cyanide over other ions, demonstrating its practical applicability to monitor cyanide contamination in different environmental samples. Furthermore, the applicability of the sensor was demonstrated using several real water samples spiked with cyanide, including creek and tap water. Notably, the sensor showed great promise for the rapid, cost-effective, and versatile monitoring of cyanide contamination in various aqueous samples.

在这项研究中，提出了一种基于市售滤纸的多功能传感平台，用于开发使用无标记金纳米粒子 (AuNPs) 检测水中氰化物的比色传感器。开发的传感器可用于在较宽的浓度范围内有效地直接检测水样中的氰化物。发现合成的 AuNP 具有约 13.2±2.65 nm 的平均尺寸，在 525 nm 附近具有表面等离子体共振峰。通过 FESEM-EDX 分析观察到 AuNPs 在 WFP 基板上的成功整合，并得到了 WFP-AuNPs 复合材料光谱上约 528 nm 吸收峰的支持。在氰化物存在下，WFP-AuNPs 复合材料的颜色从紫红色变为白色。使用纸基传感器，⁻⁶ M (0.5 ppm)。该灵敏度足以用于工业废水样品中氰化物的测定。开发的传感器还显示出对氰化物优于其他离子的优异选择性，证明其在监测不同环境样品中氰化物污染方面的实际适用性。此外，使用几种掺有氰化物的真实水样（包括溪水和自来水）证明了该传感器的适用性。值得注意的是，该传感器在对各种水样中的氰化物污染进行快速、经济和通用的监测方面显示出巨大的前景。