Agarwal, Ajay
(2019)
Functional Nano-Structures for Bio-Chemical Sensing.
In: "International Conference on Nano and Functional Materials (NFM) 2017", November 16-18, 2017, BITS - Pilani,.
(Submitted)
Abstract
Novel nano-dimensional materials and structures are being realized using chemical
methods and nanotechnologies along with standard silicon micro-fabrication technologies. These
functional materials are enabling devices which find numerous applications in the field of diagnostics, drug delivery, electronics, energy production, detecting food adulterants, Water
pollutants, etc. With the increasing awareness, healthcare is particularly in focus that includes early diagnosis, drugs discovery, point-of-care solutions, etc. For these bio-chemical applications, specific and sensitive detection of various biological and chemical species becomes crucial.
Among the various nano-materials realized, CNT, Nano-Gap and Nanowire based bio- chemical sensors are most exploited for the purpose. Nano-Gap sensors works on two principles; either on the change of the conductivity of the sensing layers between the electrodes when exposed to analytes or based on ’Electro -magnetic enhancement’ using micro Raman
spectroscopy. Nanowire sensors work on the principle of ’Ffeld Effect Transistor (FET) wherecharges associated with the chemical molecule or the biological specie is attached on the nanowire surface and acts as chemical or bio-gate; the devices are hence termed as CHEM-FET
or BIO-FET.The technologies used to realize such devices and their applications will be discussed.
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