Real‐Time Nitrophenol Detection Using Single‐Walled Carbon Nanotube Based Devices

Abstract

Single-walled carbon nanotube (SWNT) based devices have been developed for the real-time detection of nitrophenols in aqueous solution. SWNTs are assembled to electrodes using AC dielectrophoresis technique. The SWNT devices exhibit not only high sensitivity to nitrophenol compounds, but also good reusability. Charge transfer between nitro group and SWNTs, and the metal-nanotube interface modification are hypothesized to be the possible origins of conductance change. These results indicated that the SWNT devices can be utilized as a simple, low cost, sensitive, and reusable platform for real-time detection of nitrophenol compounds.

Synthesis and characterization of a substituted indolizine and investigation of its photoluminescence quenching via electron deficient nitroaromatics

“…There is an increasing demand to develop sensing devices to monitor trace nitroaromatics especially nitrophenols due to their toxicity upon inhalation and ingestion since they have been listed as potential pollutants by U.S. Environmental Protection Agency. 1 Indolizine derivatives are particularly interesting as they are well known for exhibiting a variety of pharmacologically desirable properties, including cardiovascular, anti-inflammatory and antioxidant properties, 2 as well as having known fluorescent properties and being used in sensor application. [3][4][5] Indolizine derivatives bearing β-cyclodextrin groups have mostly been used for the detection of organic volatile compounds including phenol, p-cresol, 1-adamantanol and 1-adamantonoic acid due to the inclusion…”

Nitrophenol detection using suspended SWNT films for environmental monitoring

“…A suspended SWNT films have a lower detection limit (about 1μM) than that of a nanotube sensor placed on the floor of the substrate (about 50μM) [21] in the case of 4-nitrophenol detection. This is because the suspended structure not only provides a large binding surface, but is also surrounded by detection molecules.…”

“…The current increased sharply when 4nitrophenols were added. The change in current could be explained by electrostatic gating by the charge of nitro group of nitrophenol and modulation of the Schottky barrier between SWNTs and electrodes [21]. The current devices displayed sensitivity below 1μM and tens of second response time.…”

Enhanced Electrochemical Oxidation of p-Nitrophenol Using Single-Walled Carbon Nanotubes/Silver Nanowires Hybrids Modified Electrodes

“…of their great advantages, such as simple operation, high sensitivity, fast response and in situ detection. [7][8][9][10] Since the discovery of one-dimensional single-walled carbon nanotubes (SWNTs) in 1993, their unique nanostructure and properties provide new entries into a wide range of novel electronic applications, such as ultrasensitive sensors, 11 supercapacitor, 12 battery 13 and fieldeffect transistors. 14 Due to their excellent conductivity and electrocatalytic activity, SWNTs have been used as electrode materials to prepare electrochemical sensors or biosensors.…”