wireless hydrogen sensor networksrfidjournal.net/masterpresentations/live2009/np/govt_427...wireless...
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Wireless Hydrogen Sensor Networks Using GaN-Based Devices
Fan Ren1, Jenshan Lin2, Stephen Pearton3 , Hung-Ta Wang1, Changzhi Li2, Zhen Ning Low2, Xiaogang Yu2,
Travis Anderson1, and Byoung Sam Kang1, and John Painter4
1 University of Florida, Chemical Engineering2 University of Florida, Electrical and Computer Engineering3 University of Florida, Materials Science and Engineering 4 J Painter Consulting LLC, Deltona, FL 32738
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NASA Funded Hydrogen Research at UF
• $10M funding over 4 years• 27 Projects• 60 Faculty members, post-docs, and graduate
students combinedUF NASA Funded Hydrogen Research Web Site:
http://www.mae.ufl.edu/NasaHydrogenResearch
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NASA Funded Hydrogen Research at UFResearch Thrust Areas• Fuel Cells (PEM and SOFC)• Hydrogen Production, Storage, and Transport• Nano Sensors - Hydrogen Leak Detection
Gas inlet
H2
Gas outlet Single Crystal NanowiresHydrogen-Selective Sensing at Room Temperature with
ZnO NanorodsH2 Production
PEM FC micro grids & Cooling Plate
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Motivation
Application fields:• Fuel leak detection for
automobile, space shuttle, and aircraft.
• Fire detection (CO, CO2).• Emission, hydrocarbon,
and health monitor.• Environmental control.
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Why AlGaN/GaN HEMT ?• GaN device technology is commercially available (blue LED)• Wide range band gap(6.2-3.4eV) for high temperature operation• Outstanding mechanical and electronic properties• Chemical inertness (only NaOH at 450oC), harsh environment• High electron mobility without impurity scattering- fast response -
excellent sensitivity-signal amplification• Different sensors can be integrated in a single chip
GaNAlGaN
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GaN Diode Fabrication
50 µm
Optical microscopic image
GaN
Sapphire
Al0.28Ga0.72N
Ti/AuPt
SiNx
Ti/Al/Pt/Au
Device Cross-section
2DEG
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• H2→2H• Diffusion of H• Creation of a polarized
layer at the interface• Barrier-lowering• H2(gas) ↔ 2HS ↔ 2Hb ↔ 2Hi
Pd, Pt
Hi Hi
Semiconductor
H2
Hs Hs
Hb Hb
Sensing Mechanism
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Experimental Results
0.0 0.5 1.0 1.5 2.0 2.5 3.0
0
4
8
12
16
20
Cu
rren
t(m
A)
Biased Voltage (V)
Nitorgen
1% Hydrogen
−
−
= 1expexp2**F
nkTeV
kTq
TAJ Bφ ; ? ? B~ -50 meV @ room T
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GaN/AlGaN HEMT Sensor for Hydrogen
Source
Source
Gate Drain
GaN
Sapphire
AlGaN
Ti/Al/Pt/AuTi/Au
Pt
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Hardware Design
AC Wall Transformer
Regulator Regulator
Battery Backup Control
+−
+−
Sensor
Reference
ZigBeeTransceiver
Internet
Wireless Network ServerInternet Server
Cell Phone
Microcontroller
Battery/Energy Harvest
R0
R0
Ω1M
Ω1M
Ω2M
Ω2M
Vout
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YES
NO
YESNO
Initialization
SLEEP
Timer set?
Collect Data
Analyze DataThresholdDetected? Transmit Pulse
Warm up: 30 seconds 1s5s
MonitorTx data
MonitorTx data
MonitorTx data
MonitorTx data
Power Up
Power Down
1s5s 1s5s 1s5s
State flow diagram of level monitoring
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Robust Detection of Hydrogen Using AlGaN/GaN HEMT Sensing Diodes
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Sensor 1 Above Car Bay
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Sensors 4 And 6 Above Bus Bay
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Field Test
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Practical Problem-False Alarm
0.0 0.5 1.0 1.5 2.0 2.5 3.0
0
4
8
12
16
20
Cu
rren
t(m
A)
Biased Voltage (V)
Nitrogen
1% Hydrogen
Room temperature 50 °C
1. Thermal effect on semiconductor and Schottky contact.2. Voltage drift
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Differential Diodes
Optical microscopic image
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Robust Detection of Hydrogen Using Differential AlGaN/GaN Sensing Diodes
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http://ren.che.ufl.edu/app/default.aspx
Wireless Monitoring of Hydrogen Detection
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Wireless Sensor Module
Client can deactivate alarm
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Wireless pH Remote version 1.1
Features• Reconfigurable over-the-air• Ultra-low-power• 2.4Ghz wireless• Rechargeable battery• Different sensors can be implemented with
minimal design changes
Sensor
Nordic2.4Ghz TransceiverMSP430F2013Power
ManagementBattery
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Conclusions
n GaN-based sensors demonstrate rapid response (<1s) and reversibility
n Differential sensor devices eliminate sensitivity to temperature and voltage drifts
n TiB2 can be used in ohmic contacts to improve reliabilityn These sensors have been implemented in a wireless
detection circuitn Field testing is underway at Greenway Ford, Orlando, FLn We are seeking investors for a startup company
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