Abstract
Wurtzite hexagonal ZnO semiconductor nano-rods (NRs) thin films were grown on silicon substrates and silver wire with diameter equal 68 nm. Sol gel (SG) and aqueous chemical growth (ACG) methods by two steps of preparation (seed layers and nano-rod growth) are used for samples preparation. The structural and morphological properties are evaluated using X-ray diffraction (XRD) and scanning electron microscope (SEM). The proposed iron ion sensor has shown good linearity for a wide concentration range from 0.078 M/L to 0.26 M/L of iron ions. The results show that the electrode is highly sensitive to iron ions with a slope around 47.8 mV/decade with a regression coefficient R2 = 0.96.
Highlights
Biosensors development and production are currently expanding due to the recent application of several new techniques, including some derived from physical chemistry, biochemistry, thick- and thin-film physics, materials science and electronics
The growth of ZnO nano-rods was achieved by immersing ZnO seed-layer in 150 mL of aqueous solution composed of 0.025 M zinc nitrate (Zn (NO3)2) and 0.025 M hexamethylenetetramine (HMT, C6H12N4) in a conventional flask
The crystal structure of ZnO (NRs) thin films were identified by X-ray diffraction
Summary
Biosensors development and production are currently expanding due to the recent application of several new techniques, including some derived from physical chemistry, biochemistry, thick- and thin-film physics, materials science and electronics. Biochemical sensors are often simple and can offer real-time analysis of human body analytes. They represent a broad area of emerging technologies ideally suited for human health care analysis. Traditional chemical and biological analytical techniques used in various fields involve reactions that take place in solutions on addition of reagents or other bio-reactive species. In some systems these reactions take place at an electrode and they are commonly called sensors [3]-[5]
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