A Novel pH Sensor of Extended-Gate Field-Effect Transistors With Laser-Irradiated Carbon-Nanotube Network

Chien, Yun-Shan; Tsai, Wan-Lin; Lee, I-Che; Chou, Jung-Chuan; Cheng, Hsiu‐Fung

doi:10.1109/led.2012.2213794

Cited by 40 publications

(19 citation statements)

References 10 publications

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“…Comparing with the literature for other materials, the sensitivity found is quite satisfactory. 1,3,5,[12][13][14] The sensitivities using gold substrates are always higher with respect to ITO. The main reason is probably due to its better conductivity.…”

Section: Z =mentioning

confidence: 99%

“…[1][2][3][4][5][6] pH sensitive biosensors are extensively studied, since it has many applications, especially in the monitoring of biological systems such as blood, but also for chemical analysis and environment monitoring. [7][8][9][10][11] There are many options of materials that can be used as ion sensitive layers.…”

Section: Introductionmentioning

confidence: 99%

“…1,6,9 Recent studies shows that these sensors can have high sensitivities depending on the material used, like zinc oxide based sensors have sensitivity of 38 mV/pH, 1 tin oxide 56-58 mV/pH, 12 and indium tin oxide 55 mV/pH. 3 In the case of organic semiconductors, which are in general less used, nanostructured polyaniline and poly(vinylsulfonic acid) have a sensitivity of 58 mV/pH, 13 carbon nanotubes with 50.9 mV/pH, 5 and hibrid materials like vanadium oxide/hexadecylamine, 38.1 mV/pH. 14 The Site-Binding Model can describe the working mechanism of EGFETs.…”

Section: Introductionmentioning

confidence: 99%

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Melanin as an active layer in biosensors

et al. 2014

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The development of pH sensors is of great interest due to its extensive application in several areas such as industrial processes, biochemistry and particularly medical diagnostics. In this study, the pH sensing properties of an extended gate field effect transistor (EGFET) based on melanin thin films as active layer are investigated and the physical mechanisms related to the device operation are discussed. Thin films were produced from different melanin precursors on indium tin oxide (ITO) and gold substrates and were investigated by Atomic Force Microscopy and Electrochemical Impedance Spectroscopy. Experiments were performed in the pH range from 2 to 12. EGFETs with melanin deposited on ITO and on gold substrates showed sensitivities ranging from 31.3 mV/pH to 48.9 mV/pH, depending on the melanin precursor and the substrate used. The pH detection is associated with specific binding sites in its structure, hydroxyl groups and quinone imine.

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Section: Z =mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Melanin as an active layer in biosensors

et al. 2014

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“…Ayr›ca, mikroelektrot olarak üretilmeye ve in situ (yerinde) çal›flmalarda kullan›lmaya uygun de¤ildirler (4,5). Bu nedenle, son y›llarda, kat›-temasl› elektrotlar (SCE'lar) (6)(7)(8)(9)(10)(11)(12), kaplanm›fl tel elektrotlar (CWE'lar) (13,14), alan etkili transistörler (FET'ler) (15,16), nano çubuk elektrotlar (17,18) ve polimerik membran elektrotlar (PME'lar) (19)(20)(21)(22)(23)(24)(25)(26)(27)(28)(29)(30)(31)(32)(33) (10,27,28), aminler (11)(12)(13)24), pillar [5]arenler (29), ve kaliks [4]arenler (30)(31)(32)(33) gösterilebilir. Literatür incelendi¤inde, baz› ilaç etken maddelerinin voltametrik/amperometrik sensörlerde duyarl›l›k sa¤lamak amac›yla kullan›ld›¤› (36, 37), ancak, pH duyarl› potansiyometrik PVC membran elektrot haz›rlanmas›nda iyonofor olarak kullan›lmad›¤› tespit edilmifltir.…”

Section: Introductionunclassified

BAZI İÇECEKLERDE TİTRASYON ASİTLİĞİNİN TAYİNİ İÇİN ZOFENOPRİL KALSİYUMA DAYANAN pH ELEKTROT YAPIMI

Ertürün¹

2017

GIDA

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ÖzBu çal›flmada, baz› içeceklerde titrasyon asitli¤inin tayini için kullan›labilecek zofenopril kalsiyum'a (ZFNCa) dayanan yeni bir PVC membran pH elektrot gelifltirilmifltir Elektrot, 20±1 °C'de, 1.7-9.5 pH aral›¤›nda, 44.1±1.7 mV/pH'lik bir e¤im göstermektedir. Ayr›ca, bu elektrodun, 15 s'lik cevap süresi ve en az 12 ayl›k ömürle, iyi bir tekrarlanabilirli¤e ve yeniden üretilebilirli¤e sahip oldu¤u gözlenmifltir. Ayn› zamanda, çeflitli iyonlar varl›¤›nda H + iyonuna karfl› iyi bir seçicilik gösterdi¤i belirlenmifltir. Önerilen elektrot kullan›larak, baz› içeceklerdeki (portakal suyu, elma suyu, gazl› içecek, bira, flarap ve sirke) titrasyon asitli¤inin tayininin yap›labilece¤i gösterilmifltir. Bulunan sonuçlar geleneksel cam pH elektrotla elde edilenlerle karfl›laflt›r›ld›¤›nda, %95 GS'de (güven seviyesi), aralar›nda anlaml› bir fark olmad›¤› belirlenmifltir. Sonuç olarak, ZFNCa'a dayanan bu elektrodun, içeceklerdeki titrasyon asitli¤i tayininde cam elektroda alternatif olarak baflar›yla kullan›labildi¤i görülmüfltür.Anahtar kelimeler: PVC membran, pH elektrot, zofenopril kalsiyum, potansiyometri, pH ölçümü, titrasyon asitli¤i CONSTRUCTION OF A pH ELECTRODE BASED ON ZOFENOPRIL CALCIUM FOR THE DETERMINATION OF TITRATABLE ACIDITY IN SOME BEVERAGES AbstractIn this study, a new PVC membrane pH electrode based on zofenopril calcium (ZFNCa) available for the determination of titratable acidity in some beverages was developed. The electrode exhibited a slope of 44.1±1.7 mV/pH in the pH range 1.7-9.5 at 20±1 °C. Furthermore, it was observed that the electrode had good repeatability and reproducibility with a response time of 15 s and a lifetime of at least 12 months. Also, it was found to display good selectivity for H + ions in the presence of various ions. The applicability of the proposed electrode for the determination of titratable acidity in some beverages (orange juice, apple juice, fizzy drink, beer, wine and vinegar) was illustrated. It was seen that there were no significant differences between the results obtained with the proposed electrode and the traditional glass pH electrode at the 95% CL (confidence level). As a consequence, it was seen that the electrode based on ZFNCa could be successfully used as an alternative for glass electrode to determine the titratable acidity in beverages.

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“…Although pH-sensitive glass electrode has distinguished response characteristics and has been in use for such a long period, it has certain setbacks such as its high resistance, fragility, its instability in hydrofluoric acid or fluoride solutions, alkaline and acid errors and its unsuitability to serve as a microelectrode for biological applications [4,5]. Accordingly, the studies to develop non-glass pH-sensitive electrodes such as solid contact electrodes (SCE's) [1,[6][7][8][9][10][11][12][13], coated wire electrodes (CWE's) [13,14], field effect transistors (FET's) [15,16], nanorod based electrodes [17,18] and polymeric membrane electrodes [19][20][21][22][23][24][25][26][27][28][29][30][31][32][33] have gained interest. Among these, PVC membrane electrodes are the preferred ones due to their low electrical resistance and ease of construction [31,32].…”

Section: Introductionmentioning

confidence: 99%