Ultrafast coating procedure for graphene on solid-phase microextraction fibers.
Ultrafast coating procedure for graphene on solid-phase microextraction fibers.
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DOI：
10.1016/j.talanta.2013.11.047
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发表时间：
2014-02
期刊：
影响因子：
6.1
通讯作者：
Y. Wang;Xiaoyu Wang;Zhenpeng Guo;Yi Chen
中科院分区：
文献类型：
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作者：
Y. Wang;Xiaoyu Wang;Zhenpeng Guo;Yi Chen
石墨烯无与伦比的比表面积（高达2630 m2/g）使其成为理想的吸收剂。为了促进其作为固相微萃取吸附涂层的应用，建立了一种超快的方法，可以在23s内在金属纤维上涂覆一层稳定的石墨烯，涂层厚度在10到40µm之间可调。其核心思想包括：(1)使用半聚合二甲基硅氧烷作为粘合石墨烯的粘性预衬里；(2)从预衬里快速转化为弹性聚二甲基硅氧烷（PDMS）来固定粘合的石墨烯。通过直接加热金属纤维，实现了预衬里向PDMS的超快转化。该方法生产出非常稳定和耐用的纤维，能够用于至少120次提取-解吸循环，并在室温下储存至少20个月。有趣的是，这种新方法可以在纤维上覆盖一层苔藓状的石墨烯，从而大大提高纤维的提取能力。其PAHs的检出限达到2 pg/L，比已有报道的石墨烯基纤维的检出限提高了约3个数量级。该方法适用于饮料中痕量多环芳烃的直接提取，线性回归范围为10 ~ 1000 pg/L，回收率为88.9 ~ 105.3%。同一纤维峰面积的相对标准偏差为2.9 ~ 8.9%，不同纤维峰面积的相对标准偏差为3.0 ~ 10.0%。该方法也适用于对使用过的纤维进行再涂覆，并可扩展到在耐热支架上快速涂覆其他固体吸附剂。
Graphene's unsurpassed specific surface area (up to 2630 m2/g) makes it be an ideal absorbent. To promote its use as a sorption coating in solid phase microextraction, an ultrafast method was established, able to coat a stable layer of graphene on a metal fiber in only 23 s, with adjustable coating thickness between 10 and 40 µm by using sleeve barrels. The core idea includes: (1) use of semi-polymerized dimethylsiloxane as a sticky pre-liner to glue graphene and (2) rapid conversion from pre-liner to elastic polydimethylsiloxane (PDMS) to fix the glued graphene. Ultrafast conversion of the pre-liner to PDMS was achieved by direct heating of the metallic fibers. The method produced very stable and durable fibers, capable of being used for at least 120 extractions–desorption cycles and stored at room temperature for at least 20 months. Interestingly, the new method could always coat a layer of mossy graphene on the fibers to largely increase their extraction capacity. Their limit of detection reached 2 pg/L PAHs, being about 3 orders of magnitude better than that of the reported graphene-based fibers. They were applicable to the direct extraction of trace PAHs in beverages, with a linear regression range from 10 to 1000 pg/L, and recoveries of 88.9–105.3%. The relative standard deviations of peak area were 2.9–8.9% for the same fiber and 3.0–10.0% for different fibers. The method is also suitable for re-coating a used fiber and extendable to fast coating other solid sorbents on heat-resistant supports.