کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8032632 | 1517956 | 2018 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of galvanostatic electrodeposition parameters on the structure-property relationships of polyaniline thin films and their use as potentiometric and optical pH sensors
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Galvanostaticaly electrodeposited polyaniline thin films were used as both potentiometric and optical pH chemical sensor. The galvanostatic deposition parameters were: deposited charge from 150 to 600â¯mCâ¯cmâ2, current density from 0.5 to 1.0â¯mAâ¯cmâ2 and deposition time from 150 to 1200â¯s. The electrodeposited polyaniline thin films in these conditions presented passivation charge 150â¯Â±â¯12â¯mCâ¯cmâ2. The variation of the deposition parameters led to the production of thin films with distinct properties and characteristics. Basically, they presented two distinct oxidation states. The set of films produced using a current density of 0.5â¯mAâ¯cmâ2 showed the best performances for both sensors, reaching a sensitivity of 81â¯Â±â¯1â¯mVâ¯pHâ1 and 30â¯Â±â¯3â¯pHâ1 for the potentiometric and optical pH chemical sensor, respectively. This set of films presented the best performances because they had a partially oxidized structure, the emeraldine base, which has the largest protonation potential and reaches a high electrical conductivity. The understanding of the mechanisms involved in pH detection is discussed based on the structure-property relationship established by the characterization of the PANI thin films together with the polymer's electrochemical and optical mechanism of sensitivity to pH variation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thin Solid Films - Volume 656, 30 June 2018, Pages 14-21
Journal: Thin Solid Films - Volume 656, 30 June 2018, Pages 14-21
نویسندگان
Hugo José Nogueira Pedroza Dias Mello, Marcelo Mulato,