Kimya Bölümü

Bu koleksiyon için kalıcı URI

http://hdl.handle.net/11527/25345

Gözat

Yazar "Eroğlu, Mehmet" ile Kimya Bölümü'a göz atma
  • Öge
    Highly sensitive OFET based room temperature operated gas sensors using a thieno[3,2-b]thiophene extended phthalocyanine semiconductor
    (Royal Society of Chemistry, 2024) İşçi, Recep ; Yavuz, Özgür ; Faraji, Sheida ; Gunturkun, Dilara ; Eroğlu, Mehmet ; Majewski, Leszek A. ; Yılmaz, İsmail ; Öztürk, Turan ; https://orcid.org/0000-0003-3086-4478 ; https://orcid.org/0000-0002-0660-7474 ; https://orcid.org/0000-0001-6544-1286 ; https://orcid.org/0000-0002-5046-7456 ; https://orcid.org/0000-0003-3777-5320 ; Kimya Bölümü
    Over the past decades, organic field-effect transistor (OFET) gas sensors have maintained a rapid development. However, the majority of OFET gas sensors show insufficient detection capability towards oxidizing and hazardous gases such as nitrogen dioxide (NO2) and sulfide dioxide (SO2). In this report, a sustainable approach toward the fabrication of OFET gas sensors, consisting of a thieno[3,2-b]thiophene (TT) and phthalocyanine (Pc) based electron rich structure (TT-Pc) for the detection of both nitrogen dioxide (NO2) and sulfide dioxide (SO2) is disclosed for the first time. Khaya gum (KG), a natural, biodegradable biopolymer is used as the gate dielectric in these OFET-based sensors. Thin film properties and surface morphology of TT-Pc were investigated by UV-Vis, SEM, AFM and contact angle measurements, which indicated a uniform and smooth film formation. The UV-Vis properties were supported by computational chemistry, performed using density functional theory (DFT) for optimizing geometry and absorption of TT-Pc models. Sensitive and selective responses of 90% and 60% were obtained from TT-Pc OFET-based sensors upon exposure to 20 ppm of NO2 and SO2, respectively, under ambient conditions. One of the lowest limits of detection of ∼165 ppb was achieved for both NO2 and SO2 using a solution-processed TT-Pc sensor with a natural, biodegradable dielectric biopolymer. The sensors showed excellent long-term environmental and operational stability with only a 7% reduction of the sensor's initial response (%) upon exposure to NO2 and SO2 over nine months of operation in air.