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Ag nanoparticles-functionalized rough silicon nanowires array and its unique response characteristics to ultrararefied NO2
- Source :
- Sensors and Actuators B: Chemical. 258:730-738
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- A facile and cost-effective preparation process for Ag nanoparticles modified Si nanowires (Ag NPs@RNWs) was first developed based on the metal-assisted chemical etching (MACE)-produced Ag dendrites. Partial removal of the wrapped Ag dendrites and a crucial tetramethylammonium hydroxide (TMAH) post-etching treatment are sequentially involved in the process. The crucial step of TMAH-etching induces a loose array of needle-like SiNWs with highly rough surface (RNWs), and causes redistribution of the attached Ag NPs. HRTEM observations reveal that numerous tiny Ag NPs with size of 2–6 nm are firmly inlaid on the concave-convex surface of RNWs. Comparative investigations of NO 2 -sensing properties among the bare-SiNWs, RNWs and Ag NPs@RNWs were carried out at room temperature. The Ag NPs@RNWs sensor exhibits considerably enhanced response (about five times higher) compared with bare-SiNWs and can rapidly response ultrararefied NO 2 with deep ppb level. Above results demonstrate the considerable effect of the Ag NPs modification process developed here; the resulted rough and loose array promotes the response speed of the SiNWs sensors and the formed tiny Ag NPs contributes dramatic enhancement in response sensitivity. The enhanced response of Ag NPs@RNWs is analyzed based on Ag modification-induced electronic sensitization and TMAH etching-induced structural modulation.
- Subjects :
- Tetramethylammonium hydroxide
Materials science
Response characteristics
Metals and Alloys
Nanowire
Ag nanoparticles
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Isotropic etching
0104 chemical sciences
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
chemistry.chemical_compound
Chemical engineering
chemistry
Rough surface
Materials Chemistry
Electrical and Electronic Engineering
0210 nano-technology
High-resolution transmission electron microscopy
Silicon nanowires
Instrumentation
Subjects
Details
- ISSN :
- 09254005
- Volume :
- 258
- Database :
- OpenAIRE
- Journal :
- Sensors and Actuators B: Chemical
- Accession number :
- edsair.doi...........978c60eedb16337130931a37b4fff02a