NiPc:Borophene hybrid organic field-effect transistor based gas sensors
Inorganic Chemistry Communications, cilt.183, 2026 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 183
- Basım Tarihi: 2026
- Doi Numarası: 10.1016/j.inoche.2025.115793
- Dergi Adı: Inorganic Chemistry Communications
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, Chimica, DIALNET
- Anahtar Kelimeler: Borophene, Gas sensor, Nickel phthalocyanine, OFET, Transistor
- Maltepe Üniversitesi Adresli: Evet
Özet
We report the preparation and characterization of an Organic Field-Effect Transistor (OFET) gas sensor based on a hybrid active layer composed of Nickel Phthalocyanine (NiPc) and β-phase borophene prepared via physical exfoliation. The electrical properties and time-dependent stability of NiPc:Borophene hybrid OFETs were evaluated. According to the √ID-VG analysis obtained from transfer measurements, the device exhibits ambipolar behavior, with threshold voltages approximately Vth p= − 40.8 V and Vth,= + 40.8 V the on/off current ratio is ∼1.0 × 106 in both polarities. To assess the long-term electrical stability of the prepared NiPc:Borophene NiPc: Borophene hybrid OFETs, time-dependent bias-stress measurements were investigated. Under negative bias-stress measurements, the change in ΔVT increased significantly (ΔVT = 0.195 V at 103 s, and 0.336 V at 104 s); the mobility stability was 98,7 % at 103 s, and 97,5 % at 104 s; and the normalized current (ID/ID0) was 0.92 % at 103 s, and 0.86 % at 10(Han et al., 20184). Beside these, under positive bias-stress measurements, the change in ΔVT remained limited (ΔVT = 0.045 V at 103 s, and 0.077 V at 104 s); the mobility stability was 99,6 % at 103 s, and 99,2 % at 104 s; and the ID/ID0 was 0.97 % at 103 s, and 0.95 % at 10(Han et al., 20184). Because the changes in mobility and normalized current values were limited, it was concluded that the overall performance of the OFETs was maintained under long-term stress. Gas sensing performance was evaluated for NO₂, NH₃, and ethanol at room temperature. The sensitivities were found to be 21.39 % ppm−1 for NO₂, 5.84 % ppm−1 for NH₃, and 4.07 % ppm−1 for ethanol. The highest slope for NO₂ is consistent with its electron-withdrawing nature, which increases the hole density in the p-type channel and strongly triggers current or resistance changes. LOD values drop to as low as 0.13 ppm for NO₂; NH₃ and ethanol are 0.62 ppm and 1.10 ppm, respectively. The peak response to NO₂ is maintained at ∼25 % for three consecutive cycles, with no significant shift between cycles. This demonstrates the sensor's strong reproducibility and reversible adsorption-desorption capabilities. The NiPc:Borophene hybrid OFET sensor shows promise for use in low-power, scalable, and highly responsive environmental monitoring systems.