With the acceleration of industrialization, formaldehyde detection is becoming increasingly important. Numerous challenges persist about sensitivity and safety in the field of formaldehyde detection. This paper developed a formaldehyde detection material based on carbon dots, and effectively improved the sensitivity, safety and convenience of detection. Specifically, tannin acid (TA) was utilized as the carbon source and urea as the nitrogen source to prepare tannin/urea carbon dots (TA-CDs) with excellent performance. The fluorescence intensity of the carbon dot solution gradually decreased with increasing formaldehyde concentration. A significant linear relationship (R² = 0.99462) was observed in the range of 0.00015–0.035 mmol/L, with a practical formaldehyde detection limit of 0.296 μmol/L. This paper utilizes natural poly-phenol compound TA as the raw material, which boasts unique characteristics and low cost. TA-CDs prepared from it are abundant in surface defects and active sites, exhibiting significant advantages in formaldehyde detection and possessing immense application potential.

中文翻译：

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基于单宁碳点的甲醛检测


随着工业化进程的加快，甲醛检测的重要性日益凸显。甲醛检测领域的灵敏度和安全性仍然存在许多挑战。本文开发了一种基于碳点的甲醛检测材料，有效提高了检测的灵敏度、安全性和便利性。具体来说，以单宁酸 （TA） 为碳源，尿素为氮源，制备性能优异的单宁/尿素碳点 （TA-CDs）。碳点溶液的荧光强度随着甲醛浓度的增加而逐渐降低。在 0.00015–0.035 mmol/L 范围内观察到显著的线性关系 （R² = 0.99462），实际甲醛检出限为 0.296 μmol/L。本文以天然多酚化合物 TA 为原料，具有独特的特性和低成本。由其制备的 TA-CDs 表面缺陷和活性位点丰富，在甲醛检测方面表现出显著优势，具有巨大的应用潜力。