Jang, Chi Woong Byun, Young Tae Jhon, Young Min 2024-01-20T15:06:09Z 2024-01-20T15:06:09Z 2021-09-04 2012-03 1533-4880 https://pubs.kist.re.kr/handle/201004/129498 We fabricated carbon nanotube (CNT) based chemical sensors for marine applications by photolithography process, where the electrodes were insulated by photoresist exposing only the carbon nanotube sensing section (2 mu m gap width) for detection of ammonium ions (NH4+) in 35 parts per thousand NaCl solution used as artificial seawater environment. The l-V curve of the CNT sensor was measured by sweeping the source-drain voltage from -3 to 3 V and the on/off ratio of the CNT sensor was measured to be 20 when the gate voltage was swept from -5 to 5 V and from these results the CNTs were found to appear as a p-type semiconductor. All of the cocktail solutions prepared for experiment were measured to have similar to pH 6 which implied 99.9% of NH4+ remained ionized. We successfully detected 10, 100, 1000 nM (0.18, 1.8, 18 ppb) concentration of NH4+ in 35 parts per thousand NaCl solutions by using the CNT sensor. English AMER SCIENTIFIC PUBLISHERS Detection of 10 nM Ammonium Ions in 35 parts per thousand NaCl Solution by Carbon Nanotube Based Sensors Article 10.1166/jnn.2012.5843 1 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.12, no.3, pp.1765 - 1769 JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 12 3 1765 1769 scie scopus 000305039700006 2-s2.0-84862998760 Chemistry, Multidisciplinary Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Physics, Condensed Matter Chemistry Science & Technology - Other Topics Materials Science Physics Article Carbon Nanotube Sensor Ammonium Ion Nutrients Marine