Four linear terarylene molecules (i) 4-nitro-terphenyl-4"-methanethiol (NTM), (ii) 4-nitro-terphenyl-3",5"-dimethanethiol (NTD), (iii) ([1,1';4',1"] terphenyl-3,5-diyl)methanethiol (TM), and (iv) ([1,1';4',1?] terphenyl-3,5-diyl)dimethanethiol (TD) have been synthesized and their self-assembled monolayers (SAMs) have been obtained on polycrystalline gold. NTM and NTD SAMs have been characterized by X-ray photoelectron spectroscopy, Kelvin probe measurements, electrochemistry, and contact angle measurements. The terminal nitro group (-NO2) is irreversibly reduced to hydroxylamine (-NHOH), which can be reversibly turned into nitroso group (-NO). The direct comparison between NTM/NTD and TM/TD SAMs unambiguously shows the crucial influence of the nitro group on electrowetting properties of polycrystalline Au. The higher grade of surface tension related to NHOH has been successfully exploited for basic operations of digital mu-fluidics, such as droplets motion and merging.
Discrimination of Mercuric Ions in Piezoelectric Sensors with a Conjugated Polymeric Active Layer
Operamolla Alessandra;
2014-01-01
Abstract
Four linear terarylene molecules (i) 4-nitro-terphenyl-4"-methanethiol (NTM), (ii) 4-nitro-terphenyl-3",5"-dimethanethiol (NTD), (iii) ([1,1';4',1"] terphenyl-3,5-diyl)methanethiol (TM), and (iv) ([1,1';4',1?] terphenyl-3,5-diyl)dimethanethiol (TD) have been synthesized and their self-assembled monolayers (SAMs) have been obtained on polycrystalline gold. NTM and NTD SAMs have been characterized by X-ray photoelectron spectroscopy, Kelvin probe measurements, electrochemistry, and contact angle measurements. The terminal nitro group (-NO2) is irreversibly reduced to hydroxylamine (-NHOH), which can be reversibly turned into nitroso group (-NO). The direct comparison between NTM/NTD and TM/TD SAMs unambiguously shows the crucial influence of the nitro group on electrowetting properties of polycrystalline Au. The higher grade of surface tension related to NHOH has been successfully exploited for basic operations of digital mu-fluidics, such as droplets motion and merging.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
