Silica nanosheets (SiO₂NSs) were successfully fabricated on the superelastic nickel-titanium alloy (NiTi) wire as a novel fiber for solid-phase microextraction (SPME). Before sol-gel coating, the NiTi wire was hydrothermally treated in alkaline solution for the in situ growth of NiO/TiO₂ nanosheets (NiO/TiO₂NSs). The sol-gel coating of SiO₂ on the surface of NiO/TiO₂NSs template was investigated and a thin shell of SiO₂ was found to cover NiO/TiO₂NSs, which can enlarge the effective surface area of the SiO₂ coating. This SiO₂ capped NiO/TiO₂NSs coated NiTi ([email protected]/TiO₂@SiO₂NSs) fiber shows good extraction selectivity for polycyclic aromatic hydrocarbons (PAHs) and enhanced mechanical stability. After the self-assembled modification of SiO₂NSs by phenyltrichlorosilane, the [email protected]/TiO₂@SiO₂[email protected] fiber shows higher extraction capability for non-polar PAHs. Thus, the conditions for the extraction of PAHs were investigated and optimized coupled to HPLC with UV detection. Under the optimized conditions, the analytical parameters of the SPME-HPLC methods with the [email protected]/TiO₂@SiO₂NSs and the [email protected]/TiO₂@SiO₂[email protected] fibers were determined and compared. The SPME-HPLC method with the [email protected]/TiO₂@SiO₂[email protected] fiber was developed for the concentration and the determination of PAHs in environment water samples. The relative recovery of PAHs in real water samples spiked at 5 μg L⁻¹, 10 μg L⁻¹ and 30 μg L⁻¹ ranged from 88.1% to 109%. Furthermore, this fiber is stable due to the chemical bonding between different coatings and NiTi substrates. The fabrication of the NiO/TiO₂@SiO₂[email protected] coating on the NiTi fiber substrate is precisely controllable.

成功地在超弹性镍钛合金（NiTi）线上制备了二氧化硅纳米片（SiO ₂ NSs），将其用作固相微萃取（SPME）的新型纤维。在溶胶凝胶涂覆之前，将NiTi丝在碱性溶液中进行水热处理，以原位生长NiO / TiO ₂纳米片（NiO / TiO ₂ NSs）。研究了SiO ₂在NiO / TiO ₂ NSs模板表面的溶胶-凝胶涂层，发现SiO _2的薄壳覆盖了NiO / TiO ₂ NSs，这可以增大SiO ₂涂层的有效表面积。这种SiO ₂包覆的NiO / TiO ₂ NSs包覆的NiTi（[受电子邮件保护] / TiO₂ @SiO ₂ NSs）纤维对多环芳烃（PAHs）表现出良好的萃取选择性，并提高了机械稳定性。在通过苯基三氯硅烷对SiO ₂ NSs进行自组装改性后，[电子邮件保护] / TiO ₂ @SiO ₂ [电子邮件保护]纤维对非极性PAHs表现出更高的提取能力。因此，对PAHs的提取条件进行了研究，并与具有UV检测功能的HPLC进行了优化。在优化条件下，的SPME-HPLC方法用分析参数[电子邮件保护] /二氧化钛₂ @SiO ₂奈米及[电子邮件保护] /二氧化钛₂ @SiO ₂确定并比较[受电子邮件保护的]纤维。建立了[email protected] / TiO ₂ @SiO ₂ [email protected]纤维的SPME-HPLC方法，用于环境水中样品中PAHs的浓度和测定。多环芳烃的实际水样中的相对恢复掺入以5μg大号^-1，10微克大号^-1和30μg大号^-1范围从88.1％至109％。此外，由于不同涂层与NiTi基材之间的化学键合，该纤维是稳定的。NiTi纤维基材上NiO / TiO ₂ @SiO ₂ [受电子邮件保护]涂层的制造是可精确控制的。