A chemiresistive sensor based on conducting polymer/SWNT composite nanofibrillar matrix—effect of 100 MeV O¹⁶ion irradiation on gas sensing properties

Abstract

A facile electrochemical synthesis of poly (N-methyl pyrrole) (PNMP)/single wall carbon nanotubes (SWNTs) composite nanofibrillar matrix has been demonstrated. The composite nanostructure exhibits efficient room temperature sensing of ammonia down to 1 ppm. Towards probing the effect of SHI irradiation on the sensing capabilities, the composite backbone was subjected to irradiation under 100 MeV O 16 ion beam at various ion fluences (1 × 10 10 , 5 × 10 10 and 5 × 10 11 ions cm −2 ). Comparative morphological, electrical and field effect measurement studies were carried out as a function of ion fluence. The sensing performance of the backbones was rationally correlated to morphological and electrical modifications caused by irradiation. The backbone irradiated at 1 × 10 10 ions cm −2 fluence exhibited the best sensing behaviour for a dynamic window of 50 ppb to 50 ppm concentration of analyte with excellent linearity. The validation of the suitability of this particular sensor under elevated temperature working conditions revealed a drift of 13.47% from the initial value of baseline resistance at 65 • C. The operation of the sensor was highly stable for up to 70 days.

Tuning Coating Thickness of Iron Tetraphenyl Porphyrin on Single Walled Carbon Nanotubes by Annealing: Effect on Benzene Sensing Performance

“…Hegde et al has recently reported a high surface area TiO 2 nanotube array sensor that had lowest detection limit of 100 ppm. In line with standard protocol of validating reproducibility/reversibility characteristics of the sensor, the same was subjected to cycles of three repeated exposure at 100 ppm (fourfold of the represented validation maximum limit) concentration of benzene. The sensor exhibited excellent reversibility as shown in Figure (b; inset) and no sign of response degradation/baseline drift could be observed.…”

A high-performance structure for the bulk acoustic wave metal oxide semiconductor gas sensor

“…Gas sensors have attracted a lot of attention in recent years for their various applications in the monitoring of indoor and urban air qualities [1][2][3][4], and detection of combustible gases [5,6], explosives [7,8], toxic gases [9,10] and fire [11], etc. Metal oxide semiconductor sensors can sense reducing and oxidizing gases such as volatile organic compounds (VOCs), NH 3 , H 2 S, CO, H 2 , NOx, O 3 , etc.…”

Swift Heavy Ion Irradiation as a Tool for Homogeneous Dispersion of Nanographite Platelets within the Polymer Matrices: Toward Tailoring the Properties of PEDOT:PSS/Nanographite Nanocomposites

“…The deposited energy is transmitted to the atomic lattice by electron–phonon coupling that can induce a localized heating along the ion track of nanometric dimension, resulting in a transient thermal spike lasting for a few picoseconds. The deposited energy reorganizes the basic molecular orientation of the target material in a remarkable way. , …”

“…The deposited energy reorganizes the basic molecular orientation of the target material in a remarkable way. 36,37 Few studies in the literature report the applicability of SHI irradiation as a potential tool for tailoring the structural and electronic characteristics of polymer composites. 38,39 However, no literature, to date, has reported the use of SHI ion irradiation as a tool for dispersion of nanoparticles within the polymer matrix.…”