Electrochemical sensors: a powerful tool in analytical chemistry

Abstract

Sensores potenciométricos, amperométricos e condutométricos são sensores eletroquímicos com imensa aplicação nas áreas de meio ambiente, indústria e análises clínicas. O presente trabalho apresenta uma revisão generalizada dos aspectos fundamentais, os desenvolvimento e a contribuição destes sensores na área de química analítica, e reporta alguns aspectos relevantes dos avanços na área de sensores eletroquímicos no Brasil.Potentiometric, amperometric and conductometric electrochemical sensors have found a number of interesting applications in the areas of environmental, industrial, and clinical analyses. This review presents a general overview of the three main types of electrochemical sensors, describing fundamental aspects, developments and their contribution to the area of analytical chemistry, relating relevant aspects of the development of electrochemical sensors in Brazil.

Rancang Bangun Rangkaian Pengkondisi Sinyal Untuk Sensor Deteksi Kandungan Nitrat

“…Dengan demikian pada sensor amperometrik sangat diperlukan rangkaian pengkondisi sinyal untuk mendukung kinerja sensor tersebut. Rangkaian pengkondisi sinyal ini terdiri dari beberapa sub-blok rangkaian yaitu rangkaian sumber potensial (bias), rangkaian potensiostat, konverter arustegangan dan rangkaian output (penguat dan filter) [8,9]. Blok diagram dari rangkaian pengkondisi sinyal pada Gambar 4.…”

Analysis of sulfamethoxazole by square wave voltammetry using new carbon paste electrode

“…Recently developed electrochemical devices efficiently monitor pollutants through direct or indirect reactions between the contaminant and the electrode surface, what makes them potentially applicable in situ [2][3][4]. The large-scale use of this technology relies on the scientific knowledge and nowadays, scientists have investigated many electrodes for this purpose [5]. Gold electrode, glassy carbon electrode, platinum disc electrode, graphite electrode, chemically modified electrodes, carbon nanotube and carbon paste electrodes (CPEs) are some of the examples already reported in the literature [1,5].…”

“…The large-scale use of this technology relies on the scientific knowledge and nowadays, scientists have investigated many electrodes for this purpose [5]. Gold electrode, glassy carbon electrode, platinum disc electrode, graphite electrode, chemically modified electrodes, carbon nanotube and carbon paste electrodes (CPEs) are some of the examples already reported in the literature [1,5].…”

Electrochemical Amperometric Biosensors Based on Directly Synthesized Carbon Nanotube Electrodes

“…(5) In electrochemical amperometric sensing, in general, three types of electrode are arranged: working, reference, and counter electrodes. On the working-electrode surfaces, electroactive biomolecules are oxidized or reduced, and then electron transfer reactions occur.…”