Humidity effect on the dithiol-linked gold nanoparticles interfaced chemiresistor sensor for VOCs analysis

Pang, Pengfei; Guo, Jianli; Wu, Shuisheng; Cai, Qingyun

doi:10.1016/j.snb.2005.07.036

Cited by 30 publications

(37 citation statements)

References 23 publications

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“…The authors observed that as‐prepared films were more responsive to toluene than linked films following the order of C8S > hexanedithiol > benzenedimethanethiol. In this report the authors also observed that as‐prepared films were less responsive to all vapors tested and that the fim resistance changed from an increase to a decrease as the relative humidity concentration increased 95. They attributed this behavior to the presence of ionic impurities coming from the tetraoctylammonium bromide (TOABr) residue usually present in the Brust–Schiffrin two‐phase synthesis.…”

Section: Chemiresistive Sensing Of Vapor‐phase Moleculesmentioning

confidence: 73%

Chemiresistive Sensing with Chemically Modified Metal and Alloy Nanoparticles

Ibáñez

Zamborini

2011

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142

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This review describes the use of chemically modified pure and alloyed metal nanoparticles for chemiresistive sensing applications. Chemically modified metal nanoparticles consist of a pure or alloyed metallic core with some type of chemical coating. Researchers have studied the electronic properties of 1D, 2D, and 3D assemblies of chemically modified metal nanoparticles, and even single individual nanoparticles. The interaction with the analyte alters the conductivity of the sensitive material, providing a signal to measure the analyte concentration. This review focuses on chemiresistive sensing of a wide variety of gas- and liquid-phase analytes with metal nanoparticles coated with organothiols, ions, polymers, surfactants, and biomolecules. Different strategies used to incorporate chemically modified nanoparticles into chemiresistive sensing devices are reviewed, focusing on the different types of metal and alloy compositions, coatings, methods of assembly, and analytes (vapors, gases, liquids, biological materials), along with other important factors.

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Section: Chemiresistive Sensing Of Vapor‐phase Moleculesmentioning

confidence: 73%

Chemiresistive Sensing with Chemically Modified Metal and Alloy Nanoparticles

Ibáñez

Zamborini

2011

Small

142

136

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“…316 Since then, this octanethiol film and some other films have been tested for water response by several groups, most often as one of the analytes and less often as a potential interferent. For example, it was shown 342,343 that at humidities above 30 – 40 %RH, conductivity and capacitance of the sensors varies exponentially with humidity. Figure 39a illustrates the humidity-dependent response of a Au:C 8 SH coated resistance – capacitance sensor.…”

Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

“…The humidity not only affected the baseline of the sensor response, but, unfortunately, reduced the sensitivity of the sensor to other vapors as tested with Au:C 8 SH, Au:2-phenylethanethiol, and Au:1,6-hexanedithiol films. 342,343 Figure 39b illustrates humidity effects on the decrease in sensor sensitivity to diverse vapors. The largest effect of humidity was observed in acetone sensing (~40% signal loss at 60%RH) and the smallest effect was seen for toluene and ethyl acetate sensing (~12% signal loss at 60%RH).…”

Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

Materials and Transducers Toward Selective Wireless Gas Sensing

et al. 2011

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Introduction 7315 1.1. Diversity of Monitoring Needs of Volatiles 7315 1.2. Chemical Interferences As the Key Noise Parameter for Wireless Sensors 7316 1.3. Goals and Scope of This Review 7317 1.4. Topics That Are Out of Scope of This Review 7317 2. Anatomy of Wireless Gas Sensors 7317 2.1. Active and Passive Wireless Sensors 7318 2.2. Transducers for Wireless Passive Sensors 7319 2.3. RFID Sensors 7320 2.4. Key Performance Factors of Wireless Sensors 7320 2.5. Summary of Specific Requirements for Wireless Gas Sensors 7321 3. Need for Transducers with Multiple Response Mechanisms 7321 3.1. Limitations of Sensor Arrays for Tethered and Wireless Gas Sensing 7322 3.2. Data Processing 7322 3.3. Multivariate Sensing 7323 4. Integration of Sensing Materials with Transducers 7323 6.3. System Approach for Development of Wireless Gas Sensors 7345 6.4. Path Forward 7345 Author Information 7346 Biographies 7346 Acknowledgment 7347 References 7347

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“…The conductance was observed to drop significantly under vacuum or dry argon conditions (however, the conductance did not drop to zero) and is therefore particularly sensitive to the level of ambient humidity. It has been shown recently that chemiresistortype devices can be sensitive to humidity depending on the goldcapping agent and depending on the type of vapour detected [31]. In these devices both resistance and capacitive responses are observed in the presence of elevated humidity levels [32].…”

Section: Electrochemical Characterisation Of Sub-monolayer Gold Nanopmentioning

confidence: 99%