Trench structure assisted alignment in ultralong and dense carbon nanotube arrays

An, Jianing; Zhan, Zhaoyao; Mohan, Hari Krishna Salila Vijayalal; Sun, Gengzhi; Hansen, Reinack Varghese; Zheng, Lianxi

doi:10.1039/c4tc02317j

Cited by 16 publications

(14 citation statements)

References 65 publications

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“…On the contrary, the ZnO peak intensities decrease significantly for the hybrid‐H, implicating the crystallinity of the ZnO NPs is poor, which may be resulted from the insufficient sintering temperature because the exposure time to the laser irradiation is rather short. [7a] As a powerful tool for structural characterization of carbonaceous materials, Raman spectroscopy was employed to study the characteristics of GO and rGO–ZnO hybrids. The Raman spectrum of GO, as shown in Figure d, features two dominant peaks which correspond to the D band at 1332 cm −1 and the G band at 1594 cm −1 , respectively.…”

Section: Resultsmentioning

confidence: 99%

Single‐Step Selective Laser Writing of Flexible Photodetectors for Wearable Optoelectronics

Lim

et al. 2018

Advanced Science

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109

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The increasing demand for wearable optoelectronics in biomedicine, prosthetics, and soft robotics calls for innovative and transformative technologies that permit facile fabrication of compact and flexible photodetectors with high performance. Herein, by developing a single‐step selective laser writing strategy that can finely tailor material properties through incident photon density control and lead to the formation of hierarchical hybrid nanocomposites, e.g., reduced graphene oxide (rGO)–zinc oxide (ZnO), a highly flexible and all rGO–ZnO hybrid‐based photodetector is successfully constructed. The device features 3D ultraporous hybrid films with high photoresponsivity as the active detection layer, and hybrid nanoflakes with superior electrical conductivity as interdigitated electrodes. Benefitting from enhanced photocarrier generation because of the ultraporous film morphology, efficient separation of electron–hole pairs at rGO–ZnO heterojunctions, and fast electron transport by highly conductive rGO nanosheets, the photodetector exhibits high, linear, and reproducible responsivities to a wide range of ultraviolet (UV) intensities. Furthermore, the excellent mechanical flexibility and robustness enable the photodetector to be conformally attached to skin, thus intimately monitoring the exposure dosage of human body to UV light for skin disease prevention. This study advances the fabrication of flexible optoelectronic devices with reduced complexity, facilitating the integration of wearable optoelectronics and epidermal systems.

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Section: Resultsmentioning

confidence: 99%

Single‐Step Selective Laser Writing of Flexible Photodetectors for Wearable Optoelectronics

Lim

et al. 2018

Advanced Science

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109

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“…Potential factors, such as doping, thermal effect, and strain, may result in continuous frequency downshift in G band353637. First of all, the doping effects, including intentional doping, contaminant, or electron transfer from the substrate, do not have significant influence on such large amount of downshifts as demonstrated in our previous work38. Secondly, in order to examine the possible thermal effect induced by laser illumination, we performed a set of Raman imaging ( E laser = 2.41 eV) of an individual SWNT lying across a trenched structure (20 μm wide and 2 μm deep) at different laser power levels under identical other conditions.…”

Section: Resultsmentioning

confidence: 65%

“…Finally, the D band is invisible in all these three spectra, even in the spectrum taken from the trans segment. From a detailed statistic study by varying the trench width from 10 μm to 100 μm and the trench depth from 1 μm to 10 μm, we always found the successful formation of IMJs for partially suspended SWNTs, but there was no obvious change in line shape for fully suspended SWNTs, even occasionally large Raman shift (~10 cm −1 ) were observed38.…”

Section: Discussionmentioning

confidence: 86%

“…In the presence of trenched structures on the substrates, as SWNTs adhere to the contours of the substrate, they are zipped at the trench edges, due to the height difference between the top flat surface and the trench bottom; this “zipping motion” induces tensile strain in the SWNTs38. Such an induced strain is only about 0.5% calculated from Raman shift3840. Besides, because of the trench geometry, the middle portion of the SUS segment is bound to the surface due to the strong adhesion energy48.…”

Section: Discussionmentioning

confidence: 99%

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Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Zhan

Sun

et al. 2016

Sci Rep

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Leveraging the unique properties of single-walled carbon nanotube (SWNT) intramolecular junctions (IMJs) in innovative nanodevices and next-generation nanoelectronics requires controllable, repeatable, and large-scale preparation, together with rapid identification and comprehensive characterization of such structures. Here we demonstrate SWNT IMJs through directly growing ultralong SWNTs on trenched substrates. It is found that the trench configurations introduce axial strain in partially suspended nanotubes, and promote bending deformation in the vicinity of the trench edges. As a result, the lattice and electronic structure of the nanotubes can be locally modified, to form IMJs in the deformation regions. The trench patterns also enable pre-defining the formation locations of SWNT IMJs, facilitating the rapid identification. Elaborate Raman characterization has verified the formation of SWNT IMJs and identified their types. Rectifying behavior has been observed by electrical measurements on the as-prepared semiconducting-semiconducting (S-S) junction.

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“…The response-recovery performance of the all rGO-ZnO hybrid-based photodetector is comparable to and even superior to that of most precedent rGO-ZnO hybrid-based photodetectors with metal electrodes deposited through cumbersome lithography processes. [195,197,209]…”

Section: Sensing Performancementioning

confidence: 99%

Femtosecond laser-induced graphene for flexible electronics

Le¹

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I would like to express my sincere gratitude and appreciation to my supervisor, Prof. Kim Young Jin, for his priceless guidance, encouragement, and support in the past four years. I have learned much from his expertise and always gained a lot of inspiration from his valuable comments and suggestions. It is my fortunate to be his graduate student and I will always be grateful for his help. Especially, I would also like to thank Prof. Su Pei Chen for her kindest help and support during my PhD.

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Trench structure assisted alignment in ultralong and dense carbon nanotube arrays

Abstract: In situ improvement in the alignment of ultralong and dense CNT arrays has been achieved with the assistance of trench structures on flat substrates.

Cited by 16 publications

References 65 publications

Single‐Step Selective Laser Writing of Flexible Photodetectors for Wearable Optoelectronics

Single‐Step Selective Laser Writing of Flexible Photodetectors for Wearable Optoelectronics

Direct Preparation of Carbon Nanotube Intramolecular Junctions on Structured Substrates

Femtosecond laser-induced graphene for flexible electronics

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