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- 저자 : Wulan Septiani, Ni Luh (검색결과 4 건)
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Septiani, Ni Luh Wulan,Kaneti, Yusuf Valentino,Yuliarto, Brian,Nugraha, Brian,Dipojono, Hermawan Kresno,Takei, Toshiaki,You, Jungmok,Yamauchi, Yusuke Elsevier 2018 Sensors and actuators. B Chemical Vol.261 No.-
<P><B>Abstract</B></P> <P>This work reports a facile glycerol-assisted solvothermal method for synthesizing hierarchical three-dimensional (3D) wool-ball-like zinc oxide (ZnO) nanostructures and their subsequent modifications with multi-walled carbon nanotubes (MWCNTs) as modifiers for achieving sensitive and selective detection of toxic sulfur dioxide (SO<SUB>2</SUB>) gas. Structurally, the as-synthesized 3D wool-ball-like ZnO is assembled of two-dimensional (2D) plate-like structures, which themselves are arranged by numerous small nanoparticles. Furthermore, in this work we observed an interesting new phenomenon in which when a high concentration of MWCNTs is introduced, many small nanorods grew on the surface of the plate-like structures which assemble the 3D wool-ball-like ZnO nanostructures. When evaluated for SO<SUB>2</SUB> detection, the ZnO/MWCNTs (10:1) composite (ZnO:MWCNTs = 10:1) shows a high response of 220.8 to 70 ppm of SO<SUB>2</SUB> gas (approximately three times higher than the response of pure wool-ball-like ZnO) at an optimum operating temperature of 300 °C. Additionally, the composite also displays good stability and selectivity to SO<SUB>2</SUB> with the response to 50 ppm of SO<SUB>2</SUB> being 7–14 times higher than the responses to other tested gases at a similar concentration. The excellent sensing performance of the wool-ball-like ZnO/MWCNTs (10:1) composite is mainly attributed to: (i) the formation of <I>p</I>-<I>n</I> heterojunctions at the ZnO/MWCNTs interfaces, which greatly enhance the resistance changes upon exposure to SO<SUB>2</SUB> gas and (ii) the increased amount of adsorption sites for O<SUB>2</SUB> and SO<SUB>2</SUB> gas molecules owing to the larger surface area of the composite and defects sites generated by the functionalization process of MWCNTs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchical 3D wool-ball-like ZnO nanostructures were synthesized via a solvothermal method. </LI> <LI> 3D wool-ball like ZnO/MWCNT composites with different ratios (3:1, 5:1, and 10:1) were prepared. </LI> <LI> The 3D wool-ball like ZnO/MWCNT composite showed high response and good selectivity to SO<SUB>2</SUB> gas. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Gilang Gumilar,Ni Luh Wulan Septiani,Shofarul Wustoni,Taufik Ramdani Tohari,Wahyu Widayat,Muhammad Yusuf,Hesti L. Wiraswati,Lia Faridah,Savira Ekawardhani,Isa Anshori,Brian Yuliarto 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.127 No.-
The severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) virus has become a dangeroushuman pathogen and caused severe illness that can lead to death. Yet, the standard practical diagnostictools for detecting the SARS-CoV-2 virus require multi-step assay, including extraction and labeling steps. Thus, a simple and accurate detection tool is incredibly desirable to support on-site screening, preventingits spread. In this work, we developed a portable surface plasmon resonance (SPR) sensor chip modifiedwith metal–organic frameworks (MOF) UiO-66 that serves as an immobilization matrix of single-chainvariable fragment (scFv) receptors. Large surface area and good adsorption of UiO-66/scFv-modified surfacelead to an improvement of binding capacity towards the protein target of the SARS-CoV-2 receptorbinding domain (RBD). We further successfully demonstrated the use of this portable SPR to detect theSARS-CoV-2 virus from patients’ nasopharyngeal swab samples. Interestingly, the SPR sensors candirectly distinguish the positive and negative patients within 15 minutes on 23 samples, simultaneously,without the need for labeling, and the results are in line with the gold standard PCR tests. In addition, thedetection limit of the sensors is 10.085 105 virus/mL, which follows the standard of practical screeningtools. Therefore, these UiO-66 modified SPR chip sensors offer a rapid, label-free, and low-cost detectionof the SARS-CoV-2 virus that can be potentially developed for other infectious diseases.
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A progress review on the modification of CZTS(e)-based thin-film solar cells
Harbi Setyo Nugroho,Gema Refantero,Ni Luh Wulan Septiani,Muhammad Iqbal,Septhian Marno,Huda Abdullah,Eka Cahya Prima,Nugraha,Brian Yuliarto 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
The increasing demand for energy in recent decades due to rapid industrial and population growth hasresulted in a heavy dependence on non-renewable energy which leads to environmental problems. Solar energy has emerged as a promising candidate for renewable energy because its sources are unlimitedand do not produce pollutants that damage the environment. Among the different kind of solar cells,CZTS(e) solar cells have the advantage of reaching the Shockley–Queisser limit (SQL) of 30.9% with lowproduction costs, non-toxicity, and abundance of constituent elements. However, the current performanceof CZTS(e) solar cells is still below the commercial performance standard of at least 20%. Thisreview comprehensively addresses the limiting factors that prevent CZTS(e) solar cells from achievingcommercial grade performance. The phenomenon behind the problem will be independently highlightedand explained how it affects performance. Then, various solving methods specific to each problem thathave been carried out during the manufacturing process will be discussed. At the end of this review article,a comprehensive summary and view of the possible future prospects for the manufacture of highefficiencyCZTS(e) solar cells are provided.
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Kaneti, Yusuf Valentino,Salunkhe, Rahul R.,Wulan Septiani, Ni Luh,Young, Christine,Jiang, Xuchuan,He, Yan-Bing,Kang, Yong-Mook,Sugahara, Yoshiyuki,Yamauchi, Yusuke The Royal Society of Chemistry 2018 Journal of materials chemistry. A, Materials for e Vol.6 No.14
<P>In this work, we propose a general template-free strategy for fabricating two-dimensional mesoporous mixed oxide nanosheets, such as metal cobaltites (MCo2O4, M = Ni, Zn) through the self-deconstruction/reconstruction of highly uniform Co-based metal glycerate nanospheres into 2D Co-based metal glycerate/hydroxide nanosheets, induced by the so-called “water treatment” process at room temperature followed by their calcination in air at 260 °C. The proposed ‘self-deconstruction/reconstruction’ strategy is highly advantageous as the resulting 2D metal cobaltite nanosheets possess very high surface areas (150-200 m<SUP>2</SUP>g<SUP>−1</SUP>) and mesoporous features with narrow pore size distribution. In addition, our proposed method also enables the crystallization temperature to achieve pure metal cobaltite phase from the precursor phase to be lowered by 50 °C. Using the 2D mesoporous NiCo2O4nanosheets as a representative sample, we found that they exhibit 6-20 times higher specific capacitance and greatly enhanced capacitance retention compared to the NiCo2O4nanospheres achieved through the direct calcination of the Ni-Co glycerate nanospheres. This highlights another advantage of the proposed strategy for enhancing the electrochemical performance of the mixed oxide products for supercapacitor applications. Furthermore, the asymmetric supercapacitor (ASC) assembled using the 2D NiCo2O4nanosheets//graphene oxide (GO) exhibits a maximum energy density of 38.53 W h kg<SUP>−1</SUP>, while also showing a high capacitance retention of 91% after 2000 cycles at 5 A g<SUP>−1</SUP>. It is expected that the proposed general method may be extended to other transition metal elements for creating 2D mixed oxide nanosheets with enhanced surface areas and improved electrochemical performance.</P>
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