Crystal violet (CV), a hazardous dye, poses a serious threat to the environment and human health. This motivates us to develop a facile method for its sensitive detection. Herein, we demonstrate a rapid sensing of CV using a novel fluorescent nanomaterial, yellow emissive Se,N-codoped carbon dots (CDs). CDs with an intense photoluminescence peak at 566 nm are synthesized by a hydrothermal technique using selenourea and o-phenylenediamine as precursors. This material shows a high quantum yield of up to 16.7 %. It is found that the yellow fluorescence of CDs can be selectively quenched by CV, which makes them promising for CV sensing. The linearity is obeyed in the range of 0.02-1.60 μM, and the limit of detection is as low as 7.3 nM. After detailed investigations, the inner filter effect is proposed to be the sensing mechanism. For practical usage, the newly built method is applied to determine the trace amount of CV in fish tissue samples, and satisfactory results are obtained.

中文翻译：

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黄色发光的硒，氮掺杂的碳点，用于敏感的结晶紫荧光分析。

结晶紫（CV）是一种有害染料，对环境和人类健康构成严重威胁。这激励我们开发一种灵敏检测的简便方法。在本文中，我们演示了使用新型荧光纳米材料，黄色发光的Se，N掺杂碳点（CDs）对CV的快速检测。通过水热技术，使用硒脲和邻苯二胺作为前体合成了在566 nm具有强光致发光峰的CD。该材料显示高达16.7％的高量子产率。发现CD的黄色荧光可以被CV选择性淬灭，这使它们有望用于CV传感。线性度在0.02-1.60μM的范围内，检测极限低至7.3 nM。经过详细研究，提出了内部滤波效应为传感机制。为了实际使用，