EFFECT OF GLUCOSE ELECTRO-OXIDATION REACTION RATE BY ADDITION OF GOLD NANOPARTICLES AND MOF CU-BTC CATALYSTS ON CARBON PASTE ELECTRODES
Carbon-paste electrode can be used for detection of glucose, however, glucose is one of molecules that hard to be oxidized especially by inert electrode like carbon-paste electrode. As a common knowlede, the oxidation of glucose can be helped by adding the catalyst. Rate of oxidation of glucose o...
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| Format: | Theses |
| Language: | Indonesia |
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| Online Access: | https://digilib.itb.ac.id/gdl/view/67117 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Carbon-paste electrode can be used for detection of glucose, however, glucose is
one of molecules that hard to be oxidized especially by inert electrode like
carbon-paste electrode. As a common knowlede, the oxidation of glucose can be
helped by adding the catalyst. Rate of oxidation of glucose on electrode interface
can be represented by k0 value (or ks in some literatures). The greater the k0, the
better the catalyst will perform. To increase k0 several approaches can be used,
some of which are using gold nanoparticles, MOF Cu-BTC, and combination of
gold nanoparticles and Cu-BTC (AuNP@Cu-BTC). Cu-BTC is one type of MOFs
that can be synthesized by reacting Cu(II) ions and trimesic acid (H3BTC). Cu-
BTC has been chosen because it has nonpolar linker that can be easily bind to
carbon-paste electrode. Cu(II) ions that Cu-BTC has can catalyse glucose
electro-oxidation. Gold nanoparticles are expected to be improving the Cu-BTC
ability to oxidize glucose and can be seen by increasing of k0 value. Gold
nanoparticles can be synthesized by Turkevich method by reducing Au(III) to gold
in hot sodium citrate solution. That solution will turn purple or wine that absorbs
light with wavelenght ranging between 500 – 600 nm, indicating nanoparticles
size to be between 5-100 nm. The solution then can be mixed with Cu-BTC
directly when cooled giving AuNP@Cu-BTC which is darker compared by Cu-
BTC. Electrodes ability to detect glucose and k0 value of every electrode is
determined by cyclic voltammetry method. However, because carbon-paste
electrode is not flat electrode, its surface area must be determined by
ferro/ferricyanide solution, giving the surface area for every electrode 14.45 mm2,
13.83 mm2, 7.99 mm2, and 11.77 mm2 for carbon-paste electrode (CPE),
AuNP@CPE, Cu-BTC/CPE, and AuNP@Cu-BTC/CPE respectively. For
electrode characterization for glucose electro-oxidation is conducted in glucose
solution with NaOH 0,1 M and using cyclic voltammetry with variable scan rate,
every k0 of every electrode has been found to be 2.71x10-7 cm2/s, 4.55x10-5 cm2/s,
9.38x10-5 cm2/s, and 2.29x10-4 cm2/s for CPE, AuNP@CPE, Cu-BTC/CPE, and
AuNP@Cu-BTC/CPE respectively with electrode with best sensitivity is
AuNP@Cu-BTC/CPE which has sensitivity value of 113.631 ?A/mm.cm2. |
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