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RISS 인기검색어
- 검색키워드
- 저자 : Aryal Krishna Prasad (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Aryal, Krishna Prasad,Jeong, Hae Kyung Elsevier 2019 Chemical physics letters Vol.714 No.-
<P><B>Abstract</B></P> <P>p-Sulfonatocalix[4]arene-carbon nanotube (SC4-CNT), p-Sulfonatocalix[4]arene-thermally reduced graphite oxide (SC4-TRGO), p-Sulfonatocalix[4]arene-carbon nanotubes-thermally reduced graphite oxide (SC4-CNT-TRGO) are successfully synthesized by a simple chemical wet method. The obtained samples are characterized by using scanning electron microscopy, Fourier transform infrared spectroscopy, chronocoulometry, electron dispersive X-ray spectroscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The results confirmed that SC4 molecules are effectively loaded on the surface of CNT-TRGO composite compared to CNT and TRGO. The SC4-CNT-TRGO composite exhibits the highest supramolecular recognition of tyrosine and consequently excellent electrochemical response to the probe molecule compared to the other samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Synthesis of p-sulfonatocalix[4]arene (SC4)-carbon nanotube-thermally reduced graphite oxide for biosensor applications. </LI> <LI> Synergic effect of CNT and graphite oxide to form a complex between SC4 and tyrosine. </LI> <LI> Large surface area and increased conductivity are attribute to thermally reduced graphite oxide and CNT. </LI> <LI> Sensitivity of 0.02 mA/mM was obtained with limit of detection (LOD) value of 0.6 mmol L<SUP>−1</SUP> in the range of 0.1–1 mM. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Aryal, Krishna Prasad,Ekanayaka, Thilini K.,Gilbert, Simeon,Dowben, Peter A.,Jeong, Hae Kyung Elsevier 2020 Chemical physics letters Vol.738 No.-
<P><B>Abstract</B></P> <P>In the present study, carbon nanotube (CNT), thermally reduced graphite oxide (TRGO), and CNT-TRGO were functionalized with p-sulfonatocalix[4]arene (SC4) and then investigated for fluorescent detection of cholesterol in the presence of rhodamine 6G (R6G). All of the composite samples show effective quenching of R6G fluorescent intensity without cholesterol, but the fluorescence intensity significantly increases with the addition of cholesterol. The results indicate a strong interaction between SC4 composites and cholesterol rather than between the SC4 composites and R6G, increasing R6G fluorescence intensity in the presence of cholesterol due to the release of R6G from the SC4 composites. Formation of the complex, made of the SC4 composite plus the cholesterol, enables the detection of cholesterol in the wide range of cholesterol concentration up to 109 µM. The binding constant between SC4 and cholesterol has been calculated, indicating that the SC4 composites display the maximum binding constant of 1.9 × 10<SUP>4</SUP> M<SUP>−1</SUP> with cholesterol.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Demonstration of water soluble calixarene derivatives in the fluorescent detection. </LI> <LI> Successful functionalization of p-sulfonatocalix[4]arene (SC4) on carbon material. </LI> <LI> Fluorescent detection of cholesterol up to 109 μM. </LI> <LI> Maximum binding constant of 1.9 × 104 M<SUP>−1</SUP> between cholesterol and SC4 composites. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Aryal Krishna Prasad,정혜경 한국물리학회 2019 New Physics: Sae Mulli Vol.69 No.3
Activated carbon–carbon nanotube (AC-CNT) and -cyclodextrin–activated carbon–carbon nanotube (CD-AC-CNT) composites were synthesized successfully by using a simple chemical method and were characterized by using scanning electron microscopy, energy dispersive X-ray spectroscopy and thermogravimetric analyses. The electrochemical supramolecular recognition capability of the two composites was studied by using cyclic voltammetry, differential pulse voltammetry, and electrochemical impedance spectroscopy for ascorbic acid as the biomolecule. More significantly, differential pulse voltammetry showed that the CD-AC-CNT composite exhibited a high supramolecular recognition and enrichment capability for ascorbic acid and, consequently, displayed an excellent electrochemical response to the probe molecule.
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Aryal Krishna Prasad,박종영,정희영,강제우,강순형,안광순 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.117 No.-
A thin film of nickel-intermixed tungsten oxide (Ni-WO3) composite was assembled using a facile onestepelectrochemical deposition method. Equal proportions of Ni(OH)2 and WO3 were used to obtainNi-WO3 thin film and conducted a detail study on electrochromic energy storage properties. The compositefilm exhibited cathodic electrochromic behavior and displayed significantly improved performancecompared to the Ni(OH)2 and WO3 thin films. Assembled Ni(OH)2 and WO3 in composite thin film formeda crosslinked and deagglomerated surface; therefore, both electrochemically active surface area andcharge transfer kinetics were notably enhanced. Highest coloration efficiency (CE) of 68.5 cm2/C, optimumoptical contrast (%DT) of 61, and fast coloration response of 3.9 s were recorded for thin film compositewhile the Ni(OH)2 and WO3 thin films possessed CE values of 41.1 and 46.6 cm2/C, and %DT valuesof 28 and 35, respectively. As an energy storage material, Ni-WO3 exhibited a maximum areal capacitanceof 23.1 mF/cm2, at an applied current of 2 mA. Capacitive retention study showed an excellent retentionof 76.5% even after 2000 charge/discharge cycles. Furthermore, electrochromic performances of Ni-WO3were evaluated with a quantum-dot-sensitized solar cell, in which an applied potential of 1.15 V was sufficientfor coloring the Ni-WO3 thin film.
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