Journal
NANOMATERIALS
Volume 11, Issue 3, Pages -Publisher
MDPI
DOI: 10.3390/nano11030787
Keywords
Na+ ion; disposable sensor; fluorinated graphene; reference electrode; fluorobenzene; ISFET
Categories
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2019R1A6A3A13097247]
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [2020R1F1A1067581]
- National Research Foundation of Korea [2019R1A6A3A13097247, 2020R1F1A1067581] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A disposable Na+ ion sensor was successfully fabricated using graphene sensors and fluorinated graphene electrodes, showing good linearity and sensitivity in detecting Na+ ions in urine samples. This sensor demonstrated stable performance in real human patient urine samples.
The monitoring of Na+ ions distributed in the body has been indirectly calculated by the detection of Na+ ions in urine. We fabricated a two-dimensional (2D) Na+ ion sensor using a graphene ion-sensitive field-effect transistor (G-ISFET) and used fluorinated graphene as a reference electrode (FG-RE). We integrated G-ISFET and FG on a printed circuit board (PCB) designed in the form of a secure digital (SD) card to fabricate a disposable Na+ ion sensor. The sensitivity of the PCB tip to Na+ ions was determined to be -55.4 mV/dec. The sensor exhibited good linearity despite the presence of interfering ions in the buffer solution. We expanded the evaluation of the PCB tip to real human patient urine samples. The PCB tip exhibited a sensitivity of -0.36 mV/mM and linearly detected Na+ ions in human patient urine without any dilution process. We expect that G-ISFET with FG-RE can be used to realize a disposable Na+ ion sensor by serving as an alternative to Ag/AgCl reference electrodes.
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