High-performance pH sening membranes of extended-gate field-effect transistors (EGFETs) composed of high density horizontal-aligned carbon nanotube thin films (HACNTFs) with oxygen plasma treatment are demonstrated. Amount of oxygen-containing functional groups are decorated on the carbon nanotubes (CNTs) after the oxygen plasma treatment. These functional groups act as the sensing sites and respond to the H + or OHions in different pH solution. Therefore, these functionalized CNTFs as the pH-EGFET sensing membranes can achieve a high current sensitivity of 0.78 uA 1/2 /pH, a large current linearity of 0.998, and a wide sensing range from pH 1 to 13.
We report a theoretical investigation on the electrical characteristic of n-type resonance tunneling diode for IV-IV compound. From the analysis, it shows that PVR ratio of the D4 band is significant larger than the D2 band as due to the much smaller effective mass of the D4 band. More importantly, a different structure is employed for room temperature operation and a reasonable PVR ratio is obtained which is desired for the application.
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