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New π-extended triphenylene-based organic semiconductors in field-effect transistors
Hoang, Mai Ha,Nguyen, Duc Nghia,Ngo, Trinh Tung,Cho, Min Ju,Lee, Suk Joong,Choi, Dong Hoon Elsevier 2015 Synthetic metals Vol.209 No.-
<P><B>Abstract</B></P> <P>We demonstrated the synthesis of two new solution-processed triphenylene-based semiconductors and characterized their physical, optical, and electrochemical properties. Both were intriguingly capable of producing smooth films and high-quality microcrystalline objects. The single-crystal-based field-effect transistors (FETs) using these semiconductors displayed a maximum carrier mobility of ∼0.03cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> and a high on/off current ratio of ∼10<SUP>3</SUP>. Notably, the mobilities of the single-crystal-based FETs were measured to be two orders of magnitude greater than those of the thin-film transistors. To our knowledge, the carrier mobility obtained in this work is the highest ever reported for single-crystal FETs made of triphenylene analogues.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Two new disk-shaped semiconducting triphenylenes were synthesized. </LI> <LI> These molecules showed relatively low bandgap energies of ∼2.5eV. </LI> <LI> Their single-crystal-based field-effect transistors displayed a maximum carrier mobility of ∼0.03cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Ha, Nguyen Thi Hoang,Ha, Nguyen Thi,Nga, Tran Thi Huyen,Minh, Nguyen Ngoc,Anh, Bui Thi Kim,Hang, Nguyen Thi An,Duc, Nguyen Anh,Nhuan, Mai Trong,Kim, Kyoung-Woong Elsevier 2019 Applied geochemistry Vol.108 No.-
<P><B>Abstract</B></P> <P>Phytoremediation is a plant-based, environment-friendly, and cost-effective technology that can be potentially used to remediate contaminated media. This study was conducted to evaluate the phytoextraction and phytostabilization potential, two common techniques of phytoremediation, of 21 plant species growing naturally at the largest tungsten (W) mine in Vietnam—the second largest production of W in the world. The average concentrations in different soil fractions were in the following order: residue > organically complexed, Fe- and Mn oxide-bound > carbonate bound > exchangeable. The total concentrations of arsenic (As), cadmium (Cd), copper (Cu), and zinc (Zn) in the soil varied by 34–3390, 4.87–81.6, 14.3–2080, and 21.9–370 mg/kg, respectively. The concentrations of As, Cd, Cu, and Zn in the shoots ranged 0.71–2400, 0.05–5.55, 4.81–249, and 13.3–380 mg/kg-DW, respectively. The concentrations of As and Cd in all soil samples and Cu in 70% of soil samples collected around the mine fluctuated within 2–227, 3–54, and up to 21-folds higher than the maximum allowable limit for agricultural soils in Vietnam (QCVN 03-MT:2015/BTNMT). The results indicated that hyperaccumulation levels (mg/kg-DW) were obtained for only As in <I>Pityrogramma calomelanos</I> (2400) and <I>Pteris vittata</I> L. (1860). Based on the recorded hyperaccumulation levels, translocation and accumulation factors, biomass, and fast growth of these plants, <I>P. calomelanos</I> and <I>P. vittata</I> were considered to be promising native plants for the phytoextraction of As contaminated soils. <I>Bidens pilosa</I> L. also has great potential for phytostabilization of mining soils contaminated with As and heavy metals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Soils near multi-metal (W–F–Cu–Au–Bi) mine were contaminated with As, Cd, Cu. </LI> <LI> Arsenic in shoots were in order of Fern > Monocotyledonae > Dicotyledonae. </LI> <LI> <I>Pityrogramma calomelanos</I> and <I>Pteris vittata</I> L. suggested for phytoextraction of As. </LI> <LI> <I>Bidens pilosa</I> L. suggested for the phytostabilization of mining contaminated soils. </LI> </UL> </P>
Hoang, Mai Ha,Kim, Youngmee,Kim, Minsik,Kim, Kyung Hwan,Lee, Tae Wan,Nguyen, Duc Nghia,Kim, Sung‐,Jin,Lee, Kwangyeol,Lee, Suk Joong,Choi, Dong Hoon WILEY‐VCH Verlag 2012 Advanced Materials Vol.24 No.39
<P><B>Highly conjugated porphyrin derivatives, H<SUB>2</SUB>TP and ZnTP, are synthesized.</B> J‐aggregations of the H‐aggregated dimeric porphyrin pairs are clearly observed by their single crystal structures that facilitate slip‐stacked charge transport phenomenon. In particular, their SC‐FETs show the highest field‐effect mobilities of 0.85–2.90 cm<SUP>2</SUP> V<SUP>−1</SUP>s<SUP>−1</SUP>. Furthermore, the ZnTP‐based OPT displays a dramatic photoinduced current enhancement with a high photoresponsivity of 22 000 A W<SUP>−1</SUP> under a very low light intensity (5.6 m W cm<SUP>−2</SUP>).</P>
Mai Ha Hoang,박지은,Dinh Long Phan,Trinh Tung Ngo,Tuyen Van Nguyen,박창근,조민주,최동훈 한국고분자학회 2018 Macromolecular Research Vol.26 No.9
Two new wide-bandgap conjugated copolymers, T-3MT and 2T-3MT, containing methyl-3-thiophenecarboxylate (3MT) as a weak accepting unit and indacenodithiophene (IDT) or indacenodithienothiophene (IDTT) as ladder-type donating units, were synthesized through Stille coupling polymerization. The effects of the IDT and IDTT units on the physical, optical, and electrochemical properties of these copolymers were investigated. Polymer solar cells (PSCs) were constructed using these new copolymers and different acceptor molecules for inter-comparative analysis of their performance. The PSCs bearing the as-cast active layers with 2,2'-((2Z,2'Z)-((4,4,9,9-tetrakis(4-hexylphenyl)-4,9-dihydro-s-indaceno[1,2-b:5,6-b'] dithiophene-2,7-diyl)bis(methanylylidene))bis(3-oxo-2,3-dihydro-1H-indene-2,1-diylidene))dimalononitrile (IM-IDT) displayed the highest PCEs of 3.78−3.96%, mainly owing to the predominant face-on orientation of blend #ilm, and the relatively high open circuit voltage exceeding 1.0 V.
Hoang, Mai Ha,Cho, Min Ju,Kim, Kyung Hwan,Lee, Tae Wan,Jin, Jung-Il,Choi, Dong Hoon The Chemical Society of Japan 2010 Chemistry letters Vol.39 No.4
<P>We report on the design and synthesis of a new discotic liquid crystalline (LC) semiconducting material based on a triphenylene core. The molecule is readily soluble in common organic solvents to exhibit self-organizing long fiber structures with supramolecularly ordered columnar stacks that lie parallel to the substrate. Compared to all the previously reported triphenylene derivatives, this molecule has a relatively lower band gap energy (<I>E</I><SUB>g</SUB> = 2.53 eV), which makes it suitable for electronic and optoelectronic applications.</P>
Hoang, Van Minh,Le, Hong Chung,Kim, Bao Giang,Duong, Minh Duc,Nguyen, Duc Hinh,Vu, Quynh Mai,Nguyen, Manh Cuong,Pham, Duc Manh,Ha, Anh Duc,Yang, Jui-Chen Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.no.sup1
Two years after implementation of the graphic health warning intervention in Vietnam, it is very important to evaluate the intervention's potential impact. The objective of this paper was to predict effects of graphic health warnings on cigarette packages, particularly in reducing cigarette demand and smoking-associated deaths in Vietnam. In this study, a discrete choice experiment (DCE) method was used to evaluate the potential impact of graphic tobacco health warnings on smoking demand. To predict the impact of GHWs on reducing premature deaths associated with smoking, we constructed different static models. We adapted the method developed by University of Toronto, Canada and found that GHWs had statistically significant impact on reducing cigarette demand (up to 10.1% through images of lung damage), resulting in an overall decrease of smoking prevalence in Vietnam. We also found that between 428,417- 646,098 premature deaths would be prevented as a result of the GHW intervention. The potential impact of the GHW labels on reducing premature smoking-associated deaths in Vietnam were shown to be stronger among lower socio-economic groups.
Enhanced Performance of Organic Photovoltaic Devices by Photo-Crosslinkable Buffer Layer
강남수,Mai Ha Hoang,최동훈,주병권,홍재민,유재웅 한국고분자학회 2013 Macromolecular Research Vol.21 No.1
The performance of organic photovoltaic devices was enhanced by insertion of the photo-crosslinkable buffer layer. This buffer layer was formed by a photo curable precursor with bithiophene and pentadienyl moieties. The fill factor of the device with this buffer layer exceeded 0.7 in the organic photovoltaic cell. The characteristic of the photo-crosslinkable property enabled this buffer layer to be inserted between the hole extraction layer and the active layer, which formed an ohmic contact with both layers. The insertion of the buffer layer induced a 20%enhancement in conversion efficiency by small increases in the short-circuit current and the open-circuit voltage,and a huge increase in the fill factor. This photo-crosslinkable buffer layer acted as a leakage current reducing layer as measured by the reduced dark current. The high crystallinity and smooth surface of this buffer layer resulted in improved surface morphology and internal packing, thus enhanced the fill factor.
김명희,Mai Ha Hoang,최동훈,조민주,주현경,김동욱,이창진 한국고분자학회 2011 Macromolecular Research Vol.19 No.4
A new soluble and thermally stable nonlinear optical (NLO) polyimide was synthesized by adding both tricyanopyrroline (TCP)- and tricyanofuran (TCF)-based NLO chromophores into the polymer backbone. The NLO polyimide (PI-II) bearing two different chromophores with different sizes has a glass transition temperature of 146℃ and exhibits good film forming properties. The electro-optic coefficient of the film was 84 pm/V at 1.3 μm under a poling field of 80V/μm, even though PI-II has an unusually high chromophore density of approximately 20 wt% of TCP chromophores and 23 wt% of TCF chromophores. Even with a overall chromophore loading of 43 wt%, no severe aggregation effect was observed for the sample that exhibited a relatively high EO coefficient.