Journal
ACS SENSORS
Volume 3, Issue 3, Pages 574-579Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acssensors.8b00045
Keywords
ionic current sensing; bridge circuit; micropore; robust sensor; bacteria
Funding
- PREST, JST [JPMJPR151B, JPMJPR16F4]
- JSPS [17H04803, 16H02091, 15J03490, 17J05751]
- ImPACT Program of the Council for Science, Technology and Innovation (Cabinet Office, Government of Japan)
- Grants-in-Aid for Scientific Research [17H04803, 17J05751, 15J03490, 26706005] Funding Source: KAKEN
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Ionic current sensing methods are useful tools for detecting sub- to several-micron scale particles such as bacteria. However, conventional commercially available ionic current sensing devices are not suitable for on-site measurement use because of inherent limitations on their robustness. Here, we proposed a portable robust ionic current sensor (Robust-ICS) using a bridge circuit that offers a high signal-to-noise (S/N) ratio by suppressing background current. Because the Robust-ICS can tolerate increased noise in current sensing, a simple, lightweight electromagnetic shield can be used and measurements under large electromagnetic noise conditions can be made. The weight of the device was lowered below 4 kg and outdoor particle detection measurements were completed successfully. Accuracy of size detection of Staphylococcus aureus (S. aureus) was equivalent to that obtained by SEM imaging.
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