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Monolithic carbon structures including suspended single nanowires and nanomeshes as a sensor platform
Yeongjin Lim, Jeong-Il Heo, Marc Madou
1School of Mechanical and Advanced Materials Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 689-798, Republic of Korea. hjshin@unist.ac.kr.
Nanoscale Research Letters
|November 22, 2013
Summary
We developed a cost-effective method to create suspended carbon nanostructures for nanodevices. These robust carbon nanowires and nanomeshes show promise as versatile sensor platforms.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Engineering
Background:
- Nanomaterial-based nanodevices require cost-effective and simple nanofabrication technologies.
- Controllable formation of nanomaterial assembly is crucial for nanodevice development.
Purpose of the Study:
- To present a novel method for fabricating suspended monolithic carbon single nanowires and nanomeshes.
- To investigate the structural robustness and sensor capabilities of these carbon nanostructures.
Main Methods:
- Fabrication using two successive UV exposure steps followed by a single pyrolysis step.
- Utilizing the volume reduction during pyrolysis to shrink micro-sized photoresist into nanoscale carbon structures.
- Analyzing the tensional stress gradient and structural robustness of the resulting nanowires.
Main Results:
- Successfully fabricated suspended monolithic carbon single nanowires and nanomeshes bridging bulk carbon posts.
- Observed significant volume reduction during pyrolysis, leading to nanoscale structures.
- Demonstrated enhanced structural robustness due to tensional stress gradients and bent supports, alleviating stiction.
- Validated the feasibility of these nanostructures as sensor platforms through electrochemical, conductivity-temperature, and hydrogen gas sensing tests.
Conclusions:
- The presented nanofabrication technique is cost-effective and enables controllable formation of suspended carbon nanostructures.
- The fabricated carbon nanowires and nanomeshes exhibit enhanced structural robustness, making them suitable for nanodevice applications.
- Suspended carbon nanostructures show potential as versatile platforms for various sensing applications.
