Sensitive and selective detection of hydrocarbon/water vapor mixtures with a nanoporous silicon microcantilever

Lee, Dongkyu; Zandieh, Omid; Kim, Seonghwan; Jeon, Sangmin; Thundat, Thomas

doi:10.1016/j.snb.2014.09.036

Cited by 14 publications

(22 citation statements)

References 27 publications

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“…However, the small active area of these sensors limits their sensitivity. In order to improve the sensitivity, the cantilever surface can be nanostructured with TiO 2 nanotubes or nanorods [17,18], ZnO nanorods or nanotubes [19][20][21], carbon nanotubes [22,23], mesoporous silica [24,25]. The surface can also be nanostructured with nanowires arrays [26,27].…”

Section: Introductionmentioning

confidence: 99%

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Detection of Organophosphorous Chemical Agents with CuO-Nanorod-Modified Microcantilevers

Schlur

Agostini

Thomas

et al. 2020

Sensors

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Microcantilevers are really promising sensitive sensors despite their small surface. In order to increase this surface and consequently their sensitivity, we nanostructured them with copper oxide (CuO) nanorods. The synthesis of the nanostructure consists of the oxidation of a copper layer deposited beforehand on the surface of the sample. The oxidation is performed in an alkaline solution containing a mixture of Na(OH) and (NH4)2S2O8. The synthesis procedure was first optimized on a silicon wafer, then transferred to optical cantilever-based sensors. This transfer requires specific synthesis modifications in order to cover all the cantilever with nanorods. A masking procedure was specially developed and the copper layer deposition was also optimized. These nanostructured cantilevers were engineered in order to detect vapors of organophosphorous chemical warfare agents (CWA). The nanostructured microcantilevers were exposed to various concentration of dimethyl methylphosphonate (DMMP) which is a well-known simulant of sarin (GB). The detection measurements showed that copper oxide is able to detect DMMP via hydrogen interactions. The results showed also that the increase of the microcantilever surface with the nanostructures improves the sensors efficiency. The evolution of the detection performances of the CuO nanostructured cantilevers with the DMMP concentration was also evaluated.

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Section: Introductionmentioning

confidence: 99%

“…The surface can also be nanostructured with nanowires arrays [26,27]. Such nanostructures improve the efficiency of the microcantilever used for the detection of organophosphorous chemical warfare agents, VOCs [24,25], and explosives (detection at ppt scale) [17,24].…”

Section: Introductionmentioning

confidence: 99%

Detection of Organophosphorous Chemical Agents with CuO-Nanorod-Modified Microcantilevers

Schlur

Agostini

Thomas

et al. 2020

Sensors

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“…For the moment, the sensitivity of these micromechanical devices is limited by their small surface area. To overcome this problem, the cantilever surface can be nanostructured with TiO 2 nanotubes [ 10 ], ZnO nanorods or nanotubes [ 11 , 12 ], carbon nanotubes [ 13 , 14 ], mesoporous silica [ 15 ] or the cantilever surface is anodized in order to have a porous surface [ 16 ]. Such nanostructured cantilevers are able to detect really low concentration of explosives (ppt scale) [ 10 , 15 ] and several VOCs [ 15 , 16 ].…”

Section: Introductionmentioning

confidence: 99%

Cu(OH)2 and CuO Nanorod Synthesis on Piezoresistive Cantilevers for the Selective Detection of Nitrogen Dioxide

Schlur

Höfer²,

Ahmad³

et al. 2018

Sensors

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Self-controlled active oscillating microcantilevers with a piezoresistive readout are very promising sensitive sensors, despite their small surface. In order to increase this surface and consequently their sensitivity, we nanostructured them with copper hydroxide (Cu(OH)2) or with copper oxide (CuO) nanorods. The Cu(OH)2 rods were grown, on a homogeneous copper layer previously evaporated on the top of the cantilever. The CuO nanorods were further obtained by the annealing of the copper hydroxide nanostructures. Then, these copper based nanorods were used to detect several molecules vapors. The results showed no chemical affinity (no formation of a chemical bond) between the CuO cantilevers and the tested molecules. The cantilever with Cu(OH)2 nanorods is selective to nitrogen dioxide (NO2) in presence of humidity. Indeed, among all the tested analytes, copper hydroxide has only an affinity with NO2. Despite the absence of affinity, the cantilevers could even so condensate explosives (1,3,5-trinitro-1,3,5-triazinane (RDX) and pentaerythritol tetranitrate (PETN) on their surface when the cantilever temperature was lower than the explosives source, allowing their detection. We proved that in condensation conditions, the cantilever surface material has no importance and that the nanostructuration is useless because a raw silicon cantilever detects as well as the nanostructured ones.

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“…Compared with an optical readout and dynamic-mode cantilever, it is more promising in field detection. [7][8][9][10] Molecular recognition elements of conventional biosensors generally consist of biomolecules that are poorly stable, making the sensors unable to be used out of a laboratory. In contrast, aptamers possess characteristics of high affinity, high specificity, good thermal stability, easy preparation, and simple modification for further immobilisation procedures, making them quite suitable for applications as molecular recognition elements of biosensors.…”

Section: Introductionmentioning

confidence: 99%

Piezoresistive microcantilever aptasensor for ricin detection and kinetic analysis

Liu¹,

Tong²,

Li³

et al. 2015

AIP Advances

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Up to now, there has been no report on target molecules detection by a piezoresistive microcantilever aptasensor. In order to evaluate the test performance and investigate the response dynamic characteristics of a piezoresistive microcantilever aptasensor, a novel method for ricin detection and kinetic analysis based on a piezoresistive microcantilever aptasensor was proposed, where ricin aptamer was immobilised on the microcantilever surface by biotin-avidin binding system. Results showed that the detection limit of ricin was 0.04μg L−1 (S/N ≥ 3). A linear relationship between the response voltage and the concentration of ricin in the range of 0.2μg L−1-40μg L−1 was obtained, with the linear regression equation of ΔUe = 0.904C + 5.852 (n = 5, R = 0.991, p < 0.001). The sensor showed no response for abrin, BSA, and could overcome the influence of complex environmental disruptors, indicating high specificity and good selectivity. Recovery and reproducibility in the result of simulated samples (simulated water, soil, and flour sample) determination met the analysis requirements, which was 90.5∼95.5% and 7.85%∼9.39%, respectively. On this basis, a reaction kinetic model based on ligand-receptor binding and the relationship with response voltage was established. The model could well reflect the dynamic response of the sensor. The correlation coefficient (R) was greater than or equal to 0.9456 (p < 0.001). Response voltage (ΔUe) and response time (t0) obtained from the fitting equation on different concentrations of ricin fitted well with the measured values.

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Sensitive and selective detection of hydrocarbon/water vapor mixtures with a nanoporous silicon microcantilever

Cited by 14 publications

References 27 publications

Detection of Organophosphorous Chemical Agents with CuO-Nanorod-Modified Microcantilevers

Detection of Organophosphorous Chemical Agents with CuO-Nanorod-Modified Microcantilevers

Cu(OH)2 and CuO Nanorod Synthesis on Piezoresistive Cantilevers for the Selective Detection of Nitrogen Dioxide

Piezoresistive microcantilever aptasensor for ricin detection and kinetic analysis

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