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Carbon nanotube/polydimethylsiloxane composite micropillar arrays using non-lithographic silicon nanowires as a template for performance enhancement of triboelectric nanogenerators
(2021-02-26)
Pinming, Chinathun
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Wongwiriyapan, Winadda
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Rattanamai, Songsak
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Ketama, Nathakreat
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Treetong, Alongkot
Carbon nanotube/polydimethylsiloxane composite micropillar (CNT/PDMS MP) arrays were successfully fabricated using non-lithographic silicon nanowire (SiNW) arrays as a template for performance enhancement of triboelectric nanogenerators (TENG). The CNT/PDMS MP arrays were obtained by pouring CNT/PDMS composites on the SiNW arrays and peeled off. Surface topology of CNT/PDMS composites directly depends on morphology of SiNW arrays, which can be varied by the etching time of the typical metal-assisted chemical etching process. The micropatterned CNT/PDMS composites was mostly depicted to the SiNW array template pattern when the morphologies of the SiNW were optimized with a length of approximately 10 mm. Next, the CNT/PDMS MP arrays were utilized as a triboelectric layer of TENGs, generating the maximum output voltage of 22.84 0.85 V, enabling an approximately 18-fold improvement in an electrical output compared to the flat PDMS-based TENG. The performance enhancement of TENGs based on CNT/PDMS MP arrays are attributed to synergic effects of (1) an enhancement of electrostatic induction by CNT composites, increasing dielectric constant, and (2) an enhancement of electrification by surface texturing using non-lithographic pattern and CNT composites.
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Optimized manganese oxide nanosheet/manganese oxide thin film/ multiwalled carbon nanotubes as hybrid electrode materials for supercapacitors
(2017-01-01)
Rattanamai, Songsak
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Dulyaseree, Paweena
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Wanchaem, Thanthumrong
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Wongwiriyapan, Winadda
Manganese oxide nanosheet/manganese oxide thin film/multiwalled carbon nanotubes(s-MnO<inf>x</inf>/f-MnO<inf>x</inf>/MWNTs) were used as hybrid electrode materials for supercapacitor application. Supercapacitor performance based on these hybrid materials was optimized by varying morphologies of s-MnO<inf>x</inf>. Firstly, a MWNT paste was coated onto nickel (Ni) foam and subsequently f-MnO<inf>x</inf> was deposited onto the pre-coated MWNTs/Ni foam by galvanostatic (GS) mode of electrodeposition technique at a constant current of 1 mA/cm2 using 0.1 M KMnO<inf>4</inf> as a precursor with a fix deposited time of 5 min. Finally, s-MnO<inf>x</inf> was deposited onto the prepared f-MnO<inf>x</inf>/MWNTs/Ni foam by GS mode of electrodeposition technique at a constant current of 1 mA/cm2 using 0.1 M KMnO<inf>4</inf> as precursor with different deposited times of 10, 15 and 20 min. Each hybrid s-MnO<inf>x</inf>/f-MnO<inf>x</inf>/MWNTs electrode was characterized by cyclic voltammetry, galvanostatic charge/discharge and electrochemical impedance spectroscopy. The s-MnO<inf>x</inf>/f-MnO<inf>x</inf>/MWNTs electrode prepared by 15-min-deposited s-MnO<inf>x</inf> shows the highest specific capacitance. The capacitance improvement is attributed to the increase of electrode surface area.
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Facile synthesis of hybrid manganese oxide and multiwalled carbon nanotube by two-step electrodeposition for supercapacitor electrode
(2017-01-01)
Wanchaem, Thanthamrong
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Rattanamai, Songsak
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Dulyaseree, Paweena
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Khanchaitit, Paisan
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Wongwiriyapan, Winadda
This work presents a facile synthesis of hybrid manganese oxide and multiwalled carbon nanotube (MnO<inf>x</inf>/MWCNT) by two-step electrodeposition technique for supercapacitor electrode application. Firstly, MWCNT was deposited onto SS304 substrate by electrophoretic deposition at a constant voltage of 7 V for 5 min. MWCNT solution was prepared using sodium dodecylbenzenesulfonate (SBDS) as a surfactant. Next, MnO<inf>x</inf> was deposited onto the pre-deposited MWCNT/SS304 substrate by galvanostatic electrodeposition using 0.1 M manganese sulfate (MnSO<inf>4</inf>) solution as a precursor. The electrodeposition condition was set at a constant current of 1 mA/cm2 for 5-15 min. Nanosheet array of MnO<inf>x</inf> was formed uniformly on MWCNT. At the deposition time of 10 min, the thickness of MnO<inf>x</inf> nanosheet was approximately 40 nm. Hybrid MnO<inf>x</inf>/MWCNT was characterized its electrochemical properties by cyclic voltammetry, galvanostatic charge-discharge, and electrochemical Impedance spectroscopy. Hybrid MnO<inf>x</inf>/MWCNT shows an improved specific capacitance of 267.03 F·g-1 with a series resistance of 5.17 Ω, surpassing electrode material with only MnO<inf>x</inf> or MWCNT. The high specific capacitance would be ascribed to the integration of MWCNT and MnO<inf>x</inf> functions. MWCNT may act as a platform for MnO<inf>x</inf> deposition, resulting in an increase in electrochemically active surface area of MnO<inf>x</inf>. The obtained results indicate that this two-step electrodeposition method allows tailor-made hybrid materials with nanoscale control without using harsh and toxic chemicals or high synthesis temperature.
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Surface modification: PEG / Dextran encapsulation of SPIONs
(2017-01-01)
Pansailom, Nichakorn
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Rattanamai, Songsak
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Leepheng, Piyawan
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Rattanawarinchai, Prapakorn
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Chattrairat, Kunanon
In this work, we present an encapsulation of superparamagnetic iron oxide nanoparticles (SPIONs) by dextran40 and polyethylene glycol. The SPIONs were used due to their responsibility to the external magnetic field that recovered easily. Considering the biocompatibility, the SPIONs were encapsulated by dextran40 and polyethylene glycol MW 400 with the suitable combination ratio. The efficiency of encapsulation was evaluated and confirmed using FTIR, and TGA, respectively. The further propose of SPIONs coated with dextran40 and PEG400 can be applied in medical therapy and drug delivery.
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