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Detection of benzalkonium chloride on glass surfaces using silver nanoparticles
Nguyễn Hoàng Ly,Phuong-Dong Nguyen,Sang Jun Son,이철민,Soonmin Jang,주상우,Kyungjoo Kim,Jiseon Choi,Ye-eun Joo,Jung Il Lee 대한화학회 2022 Bulletin of the Korean Chemical Society Vol.43 No.2
Raman reporter-based surface-enhanced Raman scattering (SERS) has been used to investigate the detection of one member of a class of the cationic surfactant quaternary ammonium compounds, alkyl dimethyl benzyl ammonium chloride, also known as benzalkonium chloride (BAC). For this study, SERS was performed using silver nanoparticles (AgNPs). Density functional theory (DFT) of BAC on Ag6 clusters was introduced to estimate binding at the level of the B3LYP/LANL2DZ basis sets. As the chain length increased from n = 8 to 18, the binding energies were expected to increase by 2.1 kcal/mol. Methylene blue (MB) Raman reporter molecules were subsequently treated on BAC thin-film-covered glass surfaces. Atomic force microscopy (AFM) images were used to determine the coverage of BAC on the glass, and field-emission electron microscope (FE-SEM) images revealed the surface morphologies of the SERS substrates. A standard calibration curve was prepared to quantify BAC within a concentration range of 0.0036805 to 36?805?ppm (r2?≥?0.99), according to the BAC-correlated SERS intensities of MB Raman peaks at ~1620?cm?1 adsorbed on AgNPs. A molecular dynamics (MD) simulation supported strong adsorption of BAC on glass surfaces.
Phuong T. Ho(Phuong T. Ho ),Hee-Seong Byun(Hee-Seong Byun),Thuy T. B. Vo(Thuy T. B. Vo ),Aamir Lal(Aamir Lal ),Sukchan Lee(Sukchan Lee),Eui-Joon Kil(Eui-Joon Kil) 한국식물병리학회 2023 Plant Pathology Journal Vol.39 No.3
Sweet potato symptomless virus 1 (SPSMV-1) is a single-stranded circular DNA virus, belonging to the genus Mastrevirus (family Geminiviridae) that was first identified on sweet potato plants in South Korea in 2012. Although SPSMV-1 does not induce distinct symptoms in sweet potato plants, its co-infection with different sweet potato viruses is highly prevalent, and thus threatens sweet potato production in South Ko-rea. In this study, the complete genome sequence of a Korean isolate of SPSMV-1 was obtained by Sanger sequencing of polymerase chain reaction (PCR) am-plicons from sweet potato plants collected in the field (Suwon). An infectious clone of SPSMV-1 (1.1-mer) was constructed, cloned into the plant expression vec-tor pCAMBIA1303, and agro-inoculated into Nicotiana benthamiana using three Agrobacterium tumefaciens strains (GV3101, LBA4404, and EHA105). Although no visual differences were observed between the mock and infected groups, SPSMV-1 accumulation was detected in the roots, stems, and newly produced leaves through PCR. The A. tumefaciens strain LBA4404 was the most effective at transferring the SPSMV-1 genome to N. benthamiana. We confirmed the viral replication in N. benthamiana samples through strand-specific amplifi-cation using virion-sense- and complementary-sense-specific primer sets.
Thuy Thi Hai HO,Trinh Ngoc Phuong VU,Hieu Minh VU 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
This paper investigates factors impacting on sustainable fashion buying intention of consumers by reviewing studies about the topic and conducting a survey with consumers in Ho Chi Minh City. In detail, firstly, an interview with 15 respondents was conducted to check the understanding of concepts and questions and, secondly, the study used the convenient sampling method, with 172 samples collected and analyzed, of which young respondents accounted for the majority of the sample. The respondents tend to go shopping many times in a year, with the number of people buying fashion products from every week to every two months accounting for 65.2% totally. The findings suggest that the firms should prioritize strategies that can improve customer attitude toward sustainable fashion, making them feel good, pleasant, satisfied and favorable when engaging in sustainable fashion consumption. This study concludes that consumers need more information to enable them to make better ethical decisions. This study proposes that the major channels that consumers use to seek sustainable product information include public education, peer influence, and corporate marketing information about the products. This study concludes that public education and corporate marketing information on green consumption education is effective for improving consumer sustainable buying intention.
Effect of precursors on Cu2S counter electrode on the quantum dot sensitized solar cell performance
Phuong Ho Nhat,Van Man Tran,Tung Ha Thanh,Jun H. K.,Van Thang Bui,Vinh Lam Quang 한국물리학회 2022 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.80 No.12
Counter electrode of Cu2S on fuorine-doped tin oxide glass, which was synthesized by chemical bath deposition method in a nitrogen-purged environment with varying precursors and temperatures, is used for quantum dot sensitized solar cell fabrication. The morphology, composition and crystalline structure of the Cu2S flm were characterized by scanning electron microscopy, energy dispersive X-ray and X-ray difraction analysis. Electrochemical properties of the Cu2S flm were measured by cyclic voltammetry measurement and the highest performance of JSC=18.2 mA/cm2 , VOC=0.57 V, FF=0.38 and η=3.94% were recorded in the cell fabricated by the mixture of CuSO4 and Na2S2O3 precursors (1.0/1.0 ratio). It is the result of the enhancement of electrocatalytic activity, charge transfer and collection, and excited electron lifetime.
P-Type dye-sensitized solar cells: Enhanced performance with a NiO compact blocking layer
Ho, Phuong,Bao, Le Quoc,Ahn, Kwang-Soon,Cheruku, Rajesh,Kim, Jae Hong Elsevier 2016 Synthetic metals Vol.217 No.-
<P><B>Abstract</B></P> <P>A photoactive NiO electrode for p-type dye-sensitized solar cells (p-DSCs) has been equipped by the introduction of different coatings of a compact NiO blocking layer. This study examined the facile process for the fabrication of a compact NiO blocking layer by decomposing an ethanolic precursor solution of nickel acetate tetrahydrate. The P<SUB>1</SUB>-dye used as the photosensitizer for the NiO electrode in the p-DSCs device and their performances have been analyzed. The enhancement of both short-circuit photocurrent (Jsc) and fill factor (FF) resulted in a twofold increase in the power conversion efficiency (η). The electrochemical impedance spectroscopy (EIS) and open-circuit voltage decay (OCVD) measurements demonstrated that charge recombination was suppressed when a compact NiO blocking layer was applied. The best p-DSC was achieved by employing spin-coated process for twice. The carrier lifetime of all the devices with a compact NiO blocking layer was improved compared to the bare cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Different coatings of a compact NiO blocking layer was introduced for p-DSCs. </LI> <LI> The charge recombination was suppressed with a compact NiO blocking layer. </LI> <LI> The carrier lifetime was improved for p-DSCs with different coatings. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ho, Phuong,Thogiti, Suresh,Bao, Le Quoc,Cheruku, Rajesh,Ahn, Kwang-Soon,Hong Kim, Jae Elsevier 2018 SOLAR ENERGY -PHOENIX ARIZONA THEN NEW YORK- Vol.161 No.-
<P><B>Abstract</B></P> <P>The efficiency of tandem pn-dye-sensitized solar cells (pn-DSCs) has been limited by the poor performance of the available p-DSCs. A facile approach of introducing a compact NiO blocking layer into an active NiO photocathode network of p-DSCs and pn-DSCs is presented to enrich the power conversion efficiency (PCE) using a Co<SUP>2+/3+</SUP> redox mediator. Two photoelectrodes sensitized with different dyes (SQ for n-DSC and P1 for p-DSC) have a complementary nature in absorbing solar irradiation at different wavelengths. The constructed pn-DSC demonstrates an enhanced photovoltage compared to n-DSC, resulting in an overall PCE of 1.486%. This PCE is further improved to 1.913% by the addition of an optimized NiO blocking layer to the p-DSC; this was prepared <I>via</I> spin-coating with a nickel acetate precursor solution. All photovoltaic parameters were significantly increased with the introduction of a blocking layer compared to a bare cell.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiO blocking layer was fabricated for Co-based pn-DSCs via spin-coating method. </LI> <LI> The charge recombination was suppressed with a compact NiO blocking layer. </LI> <LI> The charge transfer and lifetime was improved for pn-DSCs with NiO blocking layer. </LI> <LI> Highest PCE of 1.913% achieved by the addition of an optimized NiO blocking layer. </LI> <LI> We have achieved one of the best PCE for pn-DSCs until today. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>A facile approach of introducing a compact NiO blocking layer into an active NiO photocathode network of pn-DSCs is presented to enrich the power conversion efficiency (PCE) using a Co<SUP>2+/3+</SUP> redox mediator. The constructed pn-DSC demonstrates an enhanced photovoltage compared to n-DSC, resulting in an overall PCE of 1.486%. This PCE is further improved to 1.913% by the addition of an optimized NiO blocking layer. All photovoltaic parameters were significantly increased with the introduction of a blocking layer compared to a bare cell.</P> <P>[DISPLAY OMISSION]</P>
Ho-Quoc-Phuong Nguyen,강희준,서영수 제어·로봇·시스템학회 2011 International Journal of Control, Automation, and Vol.9 No.2
This paper introduces a robot visual-inertial tracking algorithm for a robot manipulator intended to track an object using inertial sensors incorporated into the object. To create this algorithm, the inertial Jacobian is first newly defined in order to show the relationship between an angle set velocity vector of the object and the angular velocity vector of the robot tip. Then, the inertial Jacobian is combined with the conventional image Jacobian. Therefore, the proposed algorithm requires only two landmarks with the help of an inertial measurement unit to track a moving object with six degrees of freedom, while at least three landmarks are required in the conventional stereo visual servoing algorithm. Further, the possession of a multi-rate controller allows the integration system to out-perform conventional systems in the tracking of an object’s attitude change. A suggested application of the proposed method is tracking and selection of a container from a shipping vessel that is being affected by large waves. Simulations and experiments were conducted to verify the feasibility of the proposed methodology.
Improved Performance of P-Type DSCs with a Compact Blocking Layer Coated by Different Thicknesses
Phuong Ho,Le Quoc Bao,라제쉬체루쿠,김재홍 대한금속·재료학회 2016 ELECTRONIC MATERIALS LETTERS Vol.12 No.5
The introduction of different thicknesses of a compact NiO blocking layercoating with different spin speeds on FTO and followed by a coating ofphotoactive NiO electrode for p-type dye-sensitized solar cells (p-DSCs). This study examined the fabrication of a compact NiO blocking layer bydecomposing an ethanolic precursor solution of nickel acetate tetrahydrate. The DCBZ dye used as the photosensitizer for the NiO electrode in the p-DSCs device and their performances have been analyzed. The enhancementof photovoltaic performance and resulted from an increase in the powerconversion efficiency (η). The electrochemical impedance spectroscopy(EIS) measurement demonstrated that charge recombination was suppressedwhen a compact NiO blocking layer was applied. The results showed that thebest p-DSC was achieved by employing 3000 rpm spin-coated process fordifferent times of blocking layer.