Journal
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
Volume 851, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jelechem.2019.113471
Keywords
Gold nanoparticles; Expanded graphite; Glucose sensor; SERS
Categories
Funding
- Natural Science Foundation of Zhejiang Province in China [LY18B050004]
- General project of Zhejiang Provincial Education Department in China [Y201636590]
- National Natural Science Foundation of China [21475118]
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An integrated nanogold/expanded graphite based sensor was fabricated by a former electrochemical etching of the pencil lead electrode (PLE) and a later in-situ deposition of gold nanoparticles (AuNPs). The electrochemical pretreatment of PLE (EPLE) created a 3D graphene-like surface, enhanced the electrode surface area and facilitated the electron transfer ability within 5 min without any hazardous chemicals added. The obtained AuNPs/ EPLE sensor had an excellent electrochemical response to glucose with a wide linear concentration range, from 0.05 to 38 mM and 38 to 60 mM, and a low detection limit of 5 mu M (S/N = 3). Furthermore, the AuNPs/EPLE sensor was successfully employed to detect the glucose in human serum samples, and the results agreed well with those measured in hospital. Finally, the sensor exhibited efficient and reproducible surface-enhanced Raman scattering activities for the probe molecules.
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