Self-activated ultrahigh chemosensitivity of oxide thin film nanostructures for transparent sensors.
One of the top design priorities for semiconductor chemical sensors is developing simple, low-cost, sensitive and reliable sensors to be built in handheld devices. However, the need to implement heating elements in sensor devices, and the resulting high power consumption, remains a major obstacle for the realization of miniaturized and integrated chemoresistive thin film sensors based on metal oxides. Here we demonstrate structurally simple but extremely efficient all oxide chemoresistive sensors with ~90% transmittance at visible wavelengths. Highly effective self-activation in anisotropically self-assembled nanocolumnar tungsten oxide thin films on glass substrate with indium-tin oxide electrodes enables ultrahigh response to nitrogen dioxide and volatile organic compounds with detection limits down to parts per trillion levels and power consumption less than 0.2 microwatts. Beyond the sensing performance, high transparency at visible wavelengths creates opportunities for their use in transparent electronic circuitry and optoelectronic devices with avenues for further functional convergence.
Electronic Materials Research Center, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea.
Hi Gyu
HG
Moon
Young-Soek
YS
Shim
Do Hong
DH
Kim
Hu Young
HY
Jeong
Myoungho
M
Jeong
Joo Young
JY
Jung
Seung Min
SM
Han
Jong Kyu
JK
Kim
Jin-Sang
JS
Kim
Hyung-Ho
HH
Park
Jong-Heun
JH
Lee
Harry L
HL
Tuller
Seok-Jin
SJ
Yoon
Ho Won
HW
Jang
D055664:Electrochemical Techniques; D004867:Equipment Design; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D010087:Oxides / Q000737:chemistry*; D012666:Semiconductors
D010087:Oxides