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Surface Treatment of Inorganic CsPbI_(3) Nanocrystals with Guanidinium Iodide for Efficient Perovskite Light-Emitting Diodes with High Brightness

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Nano-Micro Letters 2022年第4期14卷 277-288页

作者： Minh Tam Hoang Amandeep Singh Pannu Yang Yang Sepideh Madani paul shaw Prashant Sonar Tuquabo Tesfamichael Hongxia Wang Faculty of Science School of Chemistry and PhysicsQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia School of Mechanical Medical and Process EngineeringFaculty of EngineeringQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Organic Photonics&Electronics(COPE) School of Chemistry and Molecular BiosciencesThe University of QueenslandBrisbaneQLD 4072Australia

The remarkable evolution of metal halide perovskites in the past decade makes them promise for next-generation optoelectronic *** particular,nanocrystals(NCs)of inorganic perovskites have demonstrated excellent performance for light-emitting and display ***,the presence of surface defects on the NCs negatively impacts their performance in ***,we report a compatible facial post-treatment of CsPbI_(3) nanocrystals using guanidinium iodide(GuI).It is found that the GuI treatment effectively passivated the halide vacancy defects on the surface of the NCs while offering effective surface protection and exciton confinement thanks to the beneficial contribution of iodide and guanidinium *** a consequence,the film of treated CsPbI_(3) nanocrystals exhibited significantly enhanced luminescence and charge transport properties,leading to high-performance light-emitting diode with maximum external quantum efficiency of 13.8%with high brightness(peak luminance of 7039 cd m^(−2) and a peak current density of 10.8 cd A^(−1)).The EQE is over threefold higher than performance of untreated device(EQE:3.8%).The operational half-lifetime of the treated devices also was significantly improved with T50 of 20 min(at current density of 25 mA cm^(−2)),outperforming the untreated devices(T50~6 min).

关键词： CsPbI_(3)perovskites Nanocrystals Light-emitting diodes Photoluminescence Surface passivation Guanidinium iodide

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Efficient CO_(2)Reduction to Formate on CsPbI_(3) Nanocrystals Wrapped with Reduced Graphene Oxide

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Nano-Micro Letters 2023年第10期15卷 1-14页

作者： Minh Tam Hoang Chen Han Zhipeng Ma Xin Mao Yang Yang Sepideh Sadat Madani paul shaw Yongchao Yang Lingyi Peng Cui Ying Toe Jian Pan Rose Amal Aijun Du Tuquabo Tesfamichael Zhaojun Han Hongxia Wang School of Chemistry and Physics Faculty of ScienceQueensland University of TechnologyBrisbaneQLD 4001Australia Centre for Materials Science Queensland University of TechnologyBrisbaneQLD 4001Australia School of Chemical Engineering The University of New South WalesKensingtonNSW 2052Australia Centre for Organic Photonics&Electronics(COPE) School of Chemistry and Molecular BiosciencesThe University of QueenslandBrisbaneQLD 4072Australia School of Engineering The University of NewcastleCallaghanNSW 2038Australia

Transformation of greenhouse gas(CO_(2))into valuable chemicals and fuels is a promising route to address the global issues of climate change and the energy *** halide perovskite catalysts have shown their potential in promoting CO_(2)reduction reaction(CO_(2)RR),however,their low phase stability has limited their application ***,we present a reduced graphene oxide(rGO)wrapped CsPbI_3 perovskite nanocrystal(NC)CO_(2)RR catalyst(CsPbI_3/rGO),demonstrating enhanced stability in the aqueous *** CsPbI_3/rGO catalyst exhibited>92%Faradaic efficiency toward formate production at a CO_(2)RR current density of~12.7 mA cm^(-2).Comprehensive characterizations revealed the superior performance of the CsPbI_3/rGO catalyst originated from the synergistic effects between the CsPbI_3 NCs and rGO,i.e.,rGO stabilized theα-CsPbI_3 phase and tuned the charge distribution,thus lowered the energy barrier for the protonation process and the formation of~*HCOO intermediate,which resulted in high CO_(2)RR selectivity toward *** work shows a promising strategy to rationally design robust metal halide perovskites for achieving efficient CO_(2)RR toward valuable fuels.

关键词： Perovskite nanocrystal Electrocatalyst Inorganic perovskite CO_(2)reduction Formate production

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An external quantum efficiency of>20%from solutionprocessed poly(dendrimer)organic light-emitting diodes

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npj Flexible Electronics 2018年第1期2卷 213-218页

作者： Fatemeh Maasoumi Ross D.Jansen-van Vuuren paul E.shaw Emma V.Puttock Ravi Chandra Raju Nagiri Jake A.McEwan Mark Bown Jenny L.O’Connell Christopher J.Dunn paul L.Burn Ebinazar B.Namdas Centre for Organic Photonics&Electronics(COPE) School of Chemistry&Molecular Biosciences and School of Mathematics&PhysicsUniversity of QueenslandSt.LuciaQLD 4072Australia CSIRO Manufacturing Research WayClaytonVIC 3168Australia

Controlling the orientation of the emissive dipole has led to a renaissance of organic light-emitting diode(OLED)research,with external quantum efficiencies(EQEs)of>30%being reported for phosphorescent *** highly efficient OLEDs are generally manufactured using evaporative methods and are comprised of small-molecule heteroleptic phosphorescent iridium(III)complexes blended with a host and additional layers to balance charge injection and *** area OLEDs for lighting and display applications would benefit from low-cost solution processing,provided that high EQEs could be ***,we show that poly(dendrimer)s consisting of a non-conjugated polymer backbone with iridium(III)complexes forming the cores of firstgeneration dendrimer side chains can be co-deposited with a host by solution processing to give highly efficient *** bilayer devices comprising the emissive layer and an electron transport layer gave an EQE of>20%at luminances of up to≈300 cd/m^(2),showing that polymer engineering can enable alignment of the emissive dipole of solution-processed phosphorescent materials.

关键词： quantum dipole light

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Identification of herbal medicinal materials using DNA barcodes

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Journal of Systematics and Evolution 2011年第3期49卷 271-283页

作者： paul Pui-Hay BUT Pang-Chui shaw School of Life Sciences The Chinese University of Hong KongShatinN.T.Hong KongChina State Key Laboratory of Phytochemistry and Plant Resources in West China(CUHK) Institute of Chinese MedicineThe Chinese University of Hong KongShatinN.T.Hong KongChina

Herbal medicinal materials have been used worldwide for centuries to maintain health and to treat ***,adulteration of herbal medicines remains a major concern of users and industry for reasons of safety and *** of herbal medicinal materials by DNA technology has been widely applied,started from the *** recent years,DNA barcoding of global plant species using four standard barcodes(rbcL,matK,trnH-psbA and ITS) has been a major focus in the fields of biodiversity and *** DNA barcodes can also be used as reliable tools to facilitate the identification of herbal medicinal materials for the safe use of herbs,quality control,and forensic *** studies have applied these DNA barcodes for the identification of herbal medicinal species and their *** present article reviews efforts in the identification of herbal medicinal materials using the standard DNA barcodes and other DNA sequence-based markers.

关键词： DNA barcode herbal medicinal materials internal transcribed spacer(ITS) matK molecular identification rbcL trnH-psbA.

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Mobilizing Crop Biodiversity

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Molecular Plant 2020年第10期13卷 1341-1344页

作者： Susan McCouch Zahra Katy Navabi Michael Abberton Noelle L.Anglin Rosa Lia Barbieri Michael Baum Kirstin Bett Helen Booker Gerald L.Brown Glenn J.Bryan Luigi Cattivelli David Charest Kellye Eversole Marcelo Freitas Kioumars Ghamkhar Dario Grattipaglia Robert Henry Maria Cleria Valadares Inglis Tofazzal Islam Zakaria Kehel paul J.Kersey Graham J.King Stephen Kresovich Emily Marden Sean Mayes Marie Noelle Ndjiondjiop Henry T.Nguyen Samuel Rezende Paiva Roberto Papa Peter W.B.Phillips Awais Rasheed Christopher Richards Mathieu Flouard Maria Jose Amstalden Sampaio Uwe Scholz paul D.shaw Brad Sherman S.Evan Staton Nils Stein Jan Svensson Mark Tester Jose Francisco Montenegro Valls Rajeev Varshney Stephen Visscher Eric von Wettberg Robbie Waugh Peter Wenzl Loren H.Rieseberg Plant Breeding and Genetics School of Integrated Plant SciencesCornell UniversityIthacaNY14853USA DivSeek Global Institute for Food Security110 Gymnasium PlaceUniversity of SaskatchewanSaskatoonSKS7N 0W9Canada lnternational Institute of Tropical Agriculture(IITA) PMB 5320Oyo RdIbadanNigeria International Potato Center(CIP)1895 Avenida La Molina Lima Peru 12Lima 15023Peru Embrapa Genetic Resources and Biotechnology Parque Estacjao BiologicaFinal Av W5 NorteCaixa Postal 0237270770-917-Brasilia DFBrazil International Center for Agricultural Research in the Dry Areas(I CAR DA) Station Exp.INRA-Quich.Rue Hafiane Cherkaoui.Agdal.Rabat-Instituts10111RabatMorocco Department of Plant Sciences University of Saskatchewan51 Campus Dr.SaskatoonSK S7N 5A8Canada Department of Plant Agriculture University of GuelphRm 316Crop Science Bldg50 Stone Rd EGuelphON N1G 2W1Canada Genome Prairie 111 Research DriveSuite 101SaskatoonSKS7N 3R2Canada The James Hutt on Institute Errol RoadInvergowrieDundeeDD25DAUK CREA Research Centre for Genomics and Bioinformaticsvia San Protaso 302Fiorenzuola d'Arda29017Italy Genome British Columbia 400-575 West 8th AvenueVancouverBCV5Z 0C4Canada International Wheat Genome Sequencing Consortium 2841 NE Marywood CtLee's SummitMO.64086USA Forage Science Grasslands Research CentreAgResearchPalmerston North4410New Zealand Queensla nd Alliance for Agriculture and Food Inn ovation University of QueenslandBrisbaneQLD 4072Australia Institute of Biotechnology and Genetic Engineering(IBGE) Bangabandhu Sheikh Mujibur Rahman Agricultural UniversityGazipur 1706Bangladesh Southern Cross University PO Box 157LismoreNSW 2480Australia Royal Botanic Gardens KewRichmondSurreyTW93AEUK Feed the Future Innovation Lab for Crop Improvement 431 Weill HallCornell UniversityIthacaNY14853USA Department of Botany and Biodiversity Research Centre University of British ColumbiaVancouverBC V6R 2A5Canada Crops For the Future(UK)CIC 76-80 Baddow Road ChelmsfordEs

Over the past 70 years,the world has witnessed extraordinary growth in crop productivity,enabled by a suite of technological advances,including higher yielding crop varieties,improved farm management,synthetic agrochemicals,and agricultural *** this"Green Revolution"intensified crop production,and is credited with reducing famine and malnutrition,its benefits were accompanied by several undesirable collateral effects(Pingali,2012).These include a narrowing of agricultural biodiversity,stemming from increased monoculture and greater reliance on a smaller number of crops and crop varieties for the majority of our *** reduction in diversity has created vulnerabilities to pest and disease epidemics,climate variation,and ultimately to human health(Harlan,1972).

关键词： intensified crops agricultural

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Analysis on variety and characteristics of maghemite

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Science China Earth Sciences 2010年第8期53卷 1153-1162页

作者： shaw John BLOEMENDAL Jan HESSE paul ROLPH Tim Department of Earth Sciences University of Liverpool Department of Geography University of Liverpool Department of Environment and Geography Macquarie University Department of Geology University of Newcastle

Maghemite (γ-Fe2O3) is a very common mineral at the earth’s surface and also an important material for making music and video tapes. Maghemite is usually synthesized from magnetite under oxidizing conditions after a few hours or a few days below a temperature of 300°C. The magnetic property of thermal instability and the chemical action after heating is an important character for maghemite. That is, it will become hematite in certain proportion after being heated above 250°C. Maghemite is therefore actually unable to have its Curie temperature measured. But late using synthetic sample, maghemite was further found partially thermal stable with a measurable Curie temperature ~645°C. During our thermally magnetic experiments for a set of synthetic magnetite, we found that extra fined grain size (pseudo single domain (PSD) and small multi-domain (MD), mainly 1-10 μm) magnetite was formed to a completely thermally stable maghemite. This maghemite can also be produced by heating the same powder up to 700°C in an oven and keeping this temperature for 10 min, then cooling it down. When the generated maghemite by these two ways is heated from room temperature to 700°C, it shows almost fully reversible, or thermally stable. We used X-ray powder diffraction and Mssbauer spectroscopy to confirm the identity of this maghemite and compared its magnetic hysteresis, high temperature magnetization, low temperature thermal demagnetization, and low temperature susceptibility with those of the original preheated magnetite. Such quickly oxidized maghemite by heating to high temperature implies some types of maghemite formed in certain natural condition can carry a thermal remnant magnetization (TRM). Four types of maghemite were characterized and discussed according to their thermal stability. Among them, partially stable and fully thermally stable maghemite after heating should possess capability of carrying TRM. There is possibly a compensation of synthetizing maghemite between heatin

关键词： maghemite paleomagnetism environmental magnetism magnetic mineral thermal stability TRM

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Application of DNA barcodes in Hedyotis L.(Spermacoceae,Rubiaceae)

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Journal of Systematics and Evolution 2011年第3期49卷 203-212页

作者： Mark P.SIMMONS paul Pui-Hay BUT Pang-Chui shaw Department of Biology Colorado State University School of Life Sciences The Chinese University of Hong Kong

The potential application of DNA barcodes of plastid(matK,trnH-psbA,petD,and rbcL) and nuclear(internal transcribed spacer(ITS) of rDNA) DNA regions was investigated for 25 Hedyotis *** ITS showed the best species discrimination by resolving 23 of the species as exclusive lineages with no shared alleles between any of the 24 distinct species(*** and *** are not supported as distinct species based on our molecular and morphological data).Conversely,rbcL performed the worst and only resolved 10 of the species as exclusive lineages,and 10 species with shared *** ITS has the advantage of high PCR amplification success and it provides good intra-and interspecific variation distribution *** most powerful plastid markers were petD and trnH-psbA,but we could amplify and sequence trnH-psbA for only 83% of the accessions *** of ITS and petD performed extremely well,with all 24 of the distinct species resolved as exclusive lineages and no shared alleles between any of the distinct *** therefore recommend ITS,or a combination of ITS and petD,as the standard DNA barcode in Hedyotis,but acknowledge that there are no shared alleles between distinct species for matK and rbcL combined.

关键词： DNA barcode Hedyotis molecular identification Rubiaceae taxonomy.

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Contribution of molecular cladistics to the taxonomy of Rutaceae in China

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Journal of Systematics and Evolution 2009年第2期47卷 144-150页

作者： paul Pui-Hay BUT Alice Wing-Sem POON Pang-Chui shaw Mark P.SIMMONS Harald GREGER Department of Biology Chinese University of Hong Kong Department of Biochemistry Chinese University of Hong Kong Department of Biology Colorado State UniversityFort Collins Comparative and Ecological Phytochemistry Faculty Center of BotanyUniversity of Vienna

The treatment of Rutaceae in the Chinese flora chose to follow Engler in recognizing Rutoideae and Toddalioideae as two separate *** and chemical comparisons,however,suggested group-ing those two subfamilies in one subfamily,*** move has received support from molecular phyloge-netic analyses,which also showed that the Chinese taxa in Euodia should be placed in Tetradium and Melicope following *** into the chemistry and molecular phylogeny of Murraya also indicated that the species in the section Bergera without yuehchukene should be removed from *** findings clearly show the value of molecular cladistics to the taxonomy of Rutaceae in China and also directions for further inves-tigations.

关键词： Bergera Euodia Melicope Murraya Rutaceae Rutoideae Tetradium Toddalioideae

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Identification of Chinese drug Taraxaci Herba and Its adulterants by LM/SEM observation

Identification of Chinese drug Taraxaci Herba and Its adulte...

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第十四届全国中药和天然药物学术研讨会

作者： Hui Cao paul But Pangchui shaw China Academy of Chinese Medical Sciences National Engineering Research Center for Modernization of Traditional Chinese Medicine The Chinese University of Hong Kong

Using light microscopy（LM） and scanning electron microscopy（SEM） methods to identify Chinese drug Pugongying（Taraxaci Herba） and six Tugongying-named *** on the cytological measured data and SEM features,the Taraxaci Herba and their adulterants samples retailed in China’s mainland,Taiwan,Hong Kong and Macau markets were identified.

关键词： Taraxaci Herba TLC SEM Identification

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REACH compliant epoxides used in the synthesis of Fe(Ⅲ)-based aerogel monoliths for target fabrication

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High Power Laser Science and Engineering 2017年第4期5卷 8-13页

作者： Alberto Vails Arrufat Magdalena Budziszewska Clement Lopez Aymeric Nguyen Jakub Sitek paul Jones Chris shaw Ian Hayes Gareth Cairns Glenn Leighton Surface Engineering and Nanotechnology Institute School of AerospaceTransport and ManufacturingCranfield UniversityMiltonKeynesBedfordshireMK43 OALUK Target Fabrication Group AWEAldermastonReadingBerkshireRG7 4PRUK

Aerogel materials manufactured from metal oxides have been used as components in numerous high-energy density physics targets. These aerogels have been identified to be used as a future target material in the AWE fielded campaigns at the US National Ignition Facility. A wide variety of metal oxide aerogels are required for future campaigns and therefore a versatile manufacturing route is sought; as such, an epoxide-assisted sol–gel route was investigated. Under the European Union Registration, Evaluation, Authorization and Restriction of Chemicals legislation, the most commonly used epoxide, propylene oxide, is recognized as a substance of very high concern(SVHC). This work sought to investigate suitable alternative epoxides for use in target manufacture. The outcome was the identification of synthesis routes for stable metal oxide aerogel monoliths using epoxides not subject to the above restrictions.

关键词： aerogel epoxide metal oxide sol–gel SVHC

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