Nanowire sensor applications based on radio frequency phase shift in coplanar waveguide

Yoon, Hargsoon; Philip, Biju; Xie, Jining; Ji, Taeksoo; Varadan, Vijay K.

doi:10.1117/12.548434

Cited by 6 publications

(9 citation statements)

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“…For example, phase monitoring of reflected waves from a resistive load in a wireless radio-frequency resonator exhibited higher sensitivity than direct resistance measurements. 263 Resistance changes of SWNT films were also employed to modulate backscattered power in chipless RFID sensors. 264 …”

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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Section: Integration Of Sensing Materials With Transducersmentioning

confidence: 99%

Materials and Transducers Toward Selective Wireless Gas Sensing

et al. 2011

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“…The other type of interrogation is characterized by a continuous interrogating signal. Kong et al have demonstrated this with carbon nanotube coated LC-tank sensor by monitoring the impedance of a loop antenna in the vicinity of the sensor with an impedance analyzer 56 .Similar results have been obtained by Yoon, with FM modulation of the interrogating signal55 .…”

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confidence: 59%

“…The frequency of resonance can be determined by the sharp dip in the S u , indicating that energy is transmitted to the resonator with little or no reflection. In the work of Yoon et al 55 , the phase of Sn of a carbon nanotube terminated coplanar waveguide is used for detection. In Kong et al 56 , the impedance of a planar tank circuit, coated with carbon nanotubes, is monitored around 10MHz.…”

Section: Properties Of Carbon Nanotubes and Mechanisms For Gas Smentioning

confidence: 99%

“…These structures can simply be conductivity devices operated at higher frequencies, where the concentration of the impurities would be deduced from the changes in the ac transfer characteristics of the material 63 . They can also be capacitors, planar inductors 56 , microwave resonators 39 " 40,58 " 63 , or simply a terminated transmission line 55 .…”

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confidence: 99%

“…Spectral domain sensors offer one significant advantage over conductivity sensors in that they can operate at a frequency suited for wireless transmission. Thus, impedance sensors are capable of creating wireless sensor nodes with minimal complexity, as shown by Yoon 55 and Kong 56 .…”

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See 2 more Smart Citations

Carbon Nanotube Based Microwave Resonator Gas Sensors

McGrath

Pham

2006

Int. J. Hi. Spe. Ele. Syst.

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This paper reviews our work on the development of microwave carbon nanotube resonator sensors for gas detection. The sensor consists of a radio frequency resonator coated with a layer of carbon nanotubes. Upon exposure to gasses, the resonant frequency of the sensor shifts to indicate the presence of gasses. Our experimental results demonstrate that the microwave carbon nanotube resonator sensor achieves a sensitivity of 4000 Hz/ppm upon exposure to ammonia and the resonant frequency is recovered when ammonia is evacuated. The sensing mechanism is dependent on electron transfer from the ammonia to the nanotubes. This sensor platform has great potential for wireless sensing network applications.

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Passive wireless sensors using electrical transition of carbon nanotube junctions in polymer matrix

Yoon

Xie

Abraham

et al. 2005

Smart Mater. Struct.

Self Cite

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This paper presents the design and development of a passive wireless sensor for the detection of bio-hazard materials and vapors using chemiresistive thin films. Composite polymer thin film with functionalized carbon nanotubes (f-CNT) and polymethylmethacrylate (PMMA) is employed as a sensing material. It is investigated that resistance change is determined with the concentration of dichloromethane vapors diffused into composite thin film, due to electrical transition from direct contact to tunneling in carbon nanotube nanojunctions. The chemiresistive film is integrated into a passive wireless system which works based on the change in phase of the reflected RF signal. Measurement results of sensors in a wireless sensing system show a large differential phase shift, which can be utilized for remote monitoring of bio-hazard vapors in real time.

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Nanowire sensor applications based on radio frequency phase shift in coplanar waveguide

Cited by 6 publications

References 0 publications

Materials and Transducers Toward Selective Wireless Gas Sensing

Materials and Transducers Toward Selective Wireless Gas Sensing

Carbon Nanotube Based Microwave Resonator Gas Sensors

Passive wireless sensors using electrical transition of carbon nanotube junctions in polymer matrix

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