| 摘要: | 本研究是利用自組裝法和溶膠-凝膠技術製備(3-巰基丙基)-3甲氧基矽烷(MPTMOS)複合金奈米粒子(AuNPs)/氧化石墨烯(GO)之可撓式濕度感測器。
首先，將內含GO的MPTMOS水解為sol-gel溶液drop coating於聚酯(PET)塑膠基板上的金電極，再將AuNPs自組裝於GO/MPTMOS sol-gel巰醇官能基上，即完成本實驗之可撓式濕度感測器製備。
再利用紫外光可見光光譜儀(UV-vis)測定所製備AuNPs，而感測膜AuNPs/GO/MPTMOS sol-gel薄膜的表面特徵則是利用原子力顯微鏡(AFM)、掃描式電子顯微鏡/電子散佈光譜(SEM/EDS)來分析其表面結構。並探討AuNPs和GO添加量對其濕度感測元件的可撓性影響及感測膜AuNPs/GO/MPTMOS sol-gel薄膜的電性和濕度感應特性。由本研究結果得知，添加9.0 wt% GO的AuNPs/GO/MPTMOS sol-gel薄膜其有最佳的可撓性、感度、良好的線性及長期穩定度，並在進一步探討AuNPs/9.0 wt% GO/MPTMOS sol-gel之感測元件其頻率變化、環境溫度及反應和恢復時間對於阻抗變化的影響。最後利用阻抗頻譜圖來說明本實驗之AuNPs/GO/MPTMOS sol-gel薄膜的反應機制。
Novel flexible impedance-type humidity sensors that were based on gold nanoparticles (AuNPs) and graphene oxide (GO) were fabricated by a combination of self-assembly and the sol–gel technique. A hydrolyzed 3-mercaptopropyltrimethoxysilane (MPTMOS) sol–gel solution that contained GO was first dropped on to the surface of a pair of comb-like Au electrodes on a polyethylene terephthalate (PET) substrate, and then AuNPs were assembled onto the thiol groups of the sol–gel network. The formed AuNPs were characterized by UV-Vis spectroscopy. The microstructure of the AuNPs/GO/MPTMOS sol-gel film was analyzed by atomic force microscope (AFM) and scanning electron microscopy (SEM). The effect of the AuNPs and the amount of GO added on the flexibility, electrical and humidity sensing properties of the AuNPs/GO/MPTMOS sol-gel films on a PET substrate were investigated. The sensor that was made from the AuNPs/GO/MPTMOS sol-gel film with 9.0 wt% added GO exhibited the greatest flexibility, sensitivity, linearity and long-term stability. The effects of applied frequency, ambient temperature, response and recovery time on the impedance of the flexible humidity sensor were also investigated. The sensing mechanism of the AuNPs/GO/MPTMOS sol-gel film was explained with reference to impedance plots. |
