Nanowelded Carbon-Nanotube-Based Solar Microcells

National Key Laboratory of Nano/Micro Fabrication Technology Key Laboratory for Thin Film and Microfabrication of the Ministry of Education Institute of Micro/Nano Science and Technology Shanghai Jiao Tong University, PR China.
Small (Impact Factor: 8.37). 09/2008; 4(9):1313-8. DOI: 10.1002/smll.200701309
Source: PubMed


A directed array of monolayer single-walled carbon nanotube (SWNTs) was nanowelded onto two asymmetrical metal electrodes with high and low work functions, resulting in a strong built-in electric field for efficient separation of photogenerated electron-hole pairs. Using standard UV lithography and lift-off process, the two metals were patterened by the overlay on silicon wafers with a 500-nm thermally oxidized layer forming the parallel electrode pairs. A 200 nm thick Al electrode was sputtered on the back of Si substrate, through which a gate voltage was supplied to the Si substrate for modulating the SWNT metal contact barrier. The SWNTs synthesized by the catalytic chemical vapor deposition (CVD) method with an average diameter of 0.9nm were dispersed fully in chloroform and aligned onto the source and drain electrodes by an AC dielectrophoresis method to form the dispersed parallel SWNT bundle array. It was found that the call can be effectively enhanced with the increase of the illumination power density.

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    • "In general, it is very difficult to fabricate an applicable engineering super-hydrophobic surface on stainless steel, because the textured films easily fall off from the stainless steel substrate. Lately, some achievements on the realization and characterization of stable super-hydrophobic surfaces on stainless steel have been made [28] [29] [30] [31] and particularly using carbon nanotube coatings [32] [33]. Furthermore , stainless steel potential applications include electrodes for super-capacitors [34], fuel cells [35], capacitive deionization [36] and capacitive mixing for extracting energy from salinity difference of water resources [37], field emission probes [38], sensors [39], catalyst support for wastewater treatment [40] and tribological applications [41]. "
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    ABSTRACT: We have taken advantage of the native surface roughness and the iron content of AISI 316 stainless steel to directly grow multi-walled carbon nanotube (MWCNT) random networks by chemical vapor deposition (CVD) at low-temperature ([Formula: see text]) without the addition of any external catalysts or time-consuming pre-treatments. In this way, super-hydrophobic MWCNT films on stainless steel sheets were obtained, exhibiting high contact angle values ([Formula: see text]) and high adhesion force (high contact angle hysteresis). Furthermore, the investigation of MWCNT films with scanning electron microscopy (SEM) reveals a two-fold hierarchical morphology of the MWCNT random networks made of hydrophilic carbonaceous nanostructures on the tip of hydrophobic MWCNTs. Owing to the Salvinia effect, the hydrophobic and hydrophilic composite surface of the MWCNT films supplies a stationary super-hydrophobic coating for conductive stainless steel. This biomimetical inspired surface not only may prevent corrosion and fouling, but also could provide low friction and drag reduction.
    Nanotechnology 03/2015; 26(14):145701. DOI:10.1088/0957-4484/26/14/145701 · 3.82 Impact Factor
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    • "Among these papers, the Schottky junction formed between metal and SWCNT is the interest of many researchers for the reason that the rectifying behavior of the depletion region formed at the SWCNTmetal interface can dissociate EHPs and convert solar energy to electricity. Metals with different work functions have been tried in the structure of " Metal/SWCNT/Metal " including Pd/SWCNT/Al [12] [13] [14], Pd/SWCNT/Hf [15], Pd/SWCNT/Sc [16], etc. However, few researches have focused on combining the BV technique with SWCNT/metal structure. "
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    ABSTRACT: This paper reports a new type betavoltaic (BV) microcell based on intrinsic p-type semiconductive single-walled carbon nanotubes (s-SWCNTs). Our device composes of Au and Ti asymmetrical electrode pairs with s-SWCNTs laid over them forming Schottky junction with Ti and ohmic contact with Au. SWCNT bundles were self-assembled between Au and Ti electrodes by Dieletrophoretic (DEP) technique, and metallic SWCNTs (m-SWCNTs) were selectively eliminated by current-induced electrical breakdown method. 3.3 mCi/cm2 thin-film radioisotope 63Ni serves as beta particles source, with 100-year half-time and low toxicity. Test results show that SWCNTs BV microcell has the open circuit voltage (VOC) of 26 mV, short circuit current density (JSC) of 2.19 μA/cm2 and energy conversion efficiency (η) of 5.20%.
    Sensors and Actuators A Physical 08/2014; 215:17–21. DOI:10.1016/j.sna.2013.08.015 · 1.90 Impact Factor
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    • "horn enables the welding of carbon nanotubes to Ti electrodes [13]. A nanoscopic Joule heat is also successfully employed for nanojoining of metallic nanowires [2] [14]. "
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    ABSTRACT: Femtosecond laser induced nonthermal processing is an emerging nanofabrication technique for delicate plasmonic devices. In this work we present a detailed investigation on the interaction between ultra-short pulses and silver nanomaterials, both experimentally and theoretically. We systematically study the laser-silver interaction at a laser fluent from 1 J/m2 to 1 MJ/m2. The optimal processing window for welding of silver nanowires occurs at fluences of 200-450 J/m2. The femtosecond laser-induced surface melting allows precise welding of silver nanowires for "T" and "X" shape circuits. These welded plasmonic circuits are successfully applied for routining light propagation.
    Proceedings of SPIE - The International Society for Optical Engineering 09/2013; DOI:10.1117/12.2022482 · 0.20 Impact Factor
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