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    甲醛傳感器的比較

    日期:2019-08-14 02:24
    瀏覽次數:126
    摘要:
    甲醛傳感器的比較
      目前已有的甲醛傳感器不多,有基于甲醛氣體的還原性的氧化物氣體傳感器、基于硅膠顆粒的可視化熒光甲醛傳感器、甲醛聲表面波氣體傳感器、基于分子篩吸附機理的甲醛氣體分子篩傳感器和甲醛氣體電子鼻。
      ①甲醛氧化物氣體傳感器的研究較多,靈敏度和恢復-響應特性也都達到了一定的高度,但選擇性不高,主要是甲醇、乙醇、苯、甲苯、硫化氫、氨氣、酒精、液化氣、汽油等的干擾,但不同的氣敏元件的干擾氣體不同,可采用復合摻雜的方法提高其選擇性。另外,適當利用傳感器的電阻-溫度特性可提高甲醛氣體氧化物傳感器的選擇性,減小材料顆粒、增大比表面積和改善氣敏材料的制備工藝從而提高氣敏材料的質量可以使氣敏元件的靈敏度和響應-恢復特性進一步提高。
      ②可視化熒光甲醛傳感器的選擇性較好,線性響應也較好,它不需要借助任何光譜儀器就能進行可視化測定,但其恢復-響應特性和靈敏度都有待進一步提高。可用于定性和半定量的可視化的檢測甲醛。
      ③聲表面波甲醛氣體傳感器受溫度、濕度影響,要進行溫度、濕度補償,選擇性和靈敏度都不高。尋找對甲醛選擇性更好,吸附力更強,敏感度更高的敏感薄膜和提高薄膜涂覆的質量是提高其氣敏性能的兩個方向。
      ④甲醛氣體分子篩傳感器的選擇性和靈敏度都有待進一步研究,恢復-響應特性也還有待進一步提高。如果能找到新的、對甲醛吸附能力更強的吸附劑,則能提高傳感器的性能。
      ⑤甲醛氣體電子鼻的抗干擾能力強,響應專一,靈敏度高,測量結果**,檢測下限低,恢復-響應特性佳,是多種傳感器和計算機技術的綜合應用。甲醛氣體電子鼻是多種甲醛傳感器復合,綜合性能較好,是將來甲醛氣體傳感器研究的重點方向。

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