pH-sensitive diamond field-effect transistors (FETs) with directly aminated channel surface

Penicillin detection with nanocrystalline‐diamond field‐effect sensor

“…The EDIS sensors show an average pH sensitivity of 40-45 mV/pH in the range of pH 4 to pH 10. A mechanism of the pH sensitivity of O-terminated NCD surfaces has been discussed in [9,16] by using the wellknown site-binding model (see, e.g. [18]).…”

“…An enzyme-modified diamondbased field-effect transistor (FET) has been realised for the detection of urea and glucose [6]. The pH-and ionsensitive properties of an electrolyte-gate FET with monocrystalline and polycrystalline diamond surfaces have been investigated in [7][8][9][10][11][12][13][14][15].…”

Characterisation of capacitive field-effect sensors with a nanocrystalline-diamond film as transducer material for multi-parameter sensing

“…Poghossian and Schöning, 2006a;Hal et al, 1996, and references there). Similar to the oxide/electrolyte interface, the presence of hydroxyl groups at the oxidised diamond surface could result in neutral (C-OH), negatively charged (C-O − ), or positively charged (C-OH 2+ ) surface groups (Song et al, 2006b;Garrido et al, 2005;Christiaens et al, 2007), depending on the pH value of the solution. As a result, at pH > pH pzc (where pH pzc is the pH value at the point of zero charge), the diamond surface will be charged negatively, and at pH < pH pzc it will be positively charged.…”

“…An enzyme-modified diamond-based field-effect transistor (FET) has been realised for the detection of urea and glucose (Song et al, 2004). The pH-and ion-sensitive properties of an electrolyte-gate FET with monocrystalline and polycrystalline diamond surfaces have been investigated in (Song et al, , 2006bKanazawa et al, 2003;Kawarada et al, 2001;Denisenko et al, 2007;Garrido et al, 2005;Rezek et al, 2006Rezek et al, , 2007Nebel et al, 2006aNebel et al, , 2006bDankerl et al, 2008). It has been observed that the electrical and electrochemical properties as well as the pH and ion (or salt) sensitivity of diamond are strongly affected by the surface termination.…”

Comparative Sensibility Study of WO3 ph Sensor Using EGFET and Ciclic Voltammetry

“…The search for simple, speedy and inexpensive analytical tests utilizing chemical compounds at very low concentrations has caused a growing need for the development of electrochemical sensors 1,2 . For example, the biosensors on basis of the pH sensor are widely utilized in the medical instruments.…”