title: Highly sensitive, direct and real-time detection of silver nanowires by using a quartz crystal microbalance.
abstract: For several decades, silver nanomaterials (AgNMs) have been used in various research areas and commercial products. Among the many AgNMs, silver nanowires (AgNWs) are one of the mostly widely used nanomaterials due to their high electrical and thermal conductivity. However, recent studies have investigated the toxicity of AgNWs. For this reason, it is necessary to develop a successful detection method of AgNWs for protecting human health. In this study, label-free, highly sensitive, direct, and real-time detection of AgNWs is performed for the first time. The detection mechanism is based on the resonance frequency shift upon the mass change from the hybridization between the probe DNA on the electrode and the linker DNA attached on AgNWs. The frequency shift is measured by using a quartz crystal microbalance. We are able to detect 1 ng ml-1of AgNWs in deionized water in real-time. Moreover, our detection method can selectively detect AgNWs among other types of one-dimensional nanomaterials and can also be applied to detection in drinking water.
authors: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors: Kuewhan
authors: K
authors: Jang
authors: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors: Chanho
authors: C
authors: Park
authors: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors: Juneseok
authors: J
authors: You
authors: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors: Jaeyeong
authors: J
authors: Choi
authors: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors: Hyunjun
authors: H
authors: Park
authors: Department of Control and Instrumentation Engineering, Korea University, Sejong 339-700, Korea.
authors: Jinsung
authors: J
authors: Park
authors: Department of Mechanical and Aerospace Engineering, Rutgers University, 98 Brett Rd, Piscataway, NJ 08854, USA.
authors: Howon
authors: H
authors: Lee
authors: Department of Mechanical Engineering, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.
authors: Chang-Hwan
authors: CH
authors: Choi
authors: Department of Mechanical Engineering, Korea University, Seoul 136-701, Korea.
authors: Sungsoo
authors: S
authors: Na