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Recently Published Articles
- PDT-S-T: A New Polymer with Optimized Molecular Conformation for Controlled Aggregation and π–π Stacking and Its Application in Efficient Photovoltaic Devices
Yue Wu, Zhaojun Li, Wei Ma, Ye Huang, Lijun Huo, Xia Guo, Maojie Zhang, Harald Ade and Jianhui Hou
Article first published online: 21 MAY 2013 | DOI: 10.1002/adma.201301174
The correlation among molecular conformation, the crystallinity of the morphology, propensity for π–π stacking, J- versus H-aggregation, and photovoltaic performance have been studied based on two newly designed polymers, PBDTTT-S-T and PDT-S-T. The results show that more linear backbone structure is helpful to improve photovoltaic properties of the polymer, and therefore, molecular conformation should be considered for molecular design of photovoltaic polymers.
- Spirocyclic Aromatic Hydrocarbon-Based Organic Nanosheets for Eco-Friendly Aqueous Processed Thin-Film Non-Volatile Memory Devices
Zong-Qiong Lin, Jin Liang, Peng-Ju Sun, Feng Liu, Yee-Yan Tay, Ming-Dong Yi, Kun Peng, Xian-Hai Xia, Ling-Hai Xie, Xin-Hui Zhou, Jian-Feng Zhao and Wei Huang
Article first published online: 21 MAY 2013 | DOI: 10.1002/adma.201301280
Supramolecular steric hindrance designs make pyrene-functionalized spiro[fluorene-9,7′-dibenzo[c,h]acridine]-5′-one (Py-SFDBAO) assemble into 2D nanostructures that facilitate aqueous phase large-area synthesis of high-quality and uniform crystalline thin films. Thin-film diodes using aqueous nanosheets as active layers exhibit a non-volatile bistable electrical switching feature with ON/OFF ratios of 6.0 × 104 and photoswitching with conductive gains of 102–103. Organic nanosheets are potentially key components for eco-friendly aqueous dispersed organic nano-inks in the application of printed and flexible electronics.
- All-In-One Optical Heater-Thermometer Nanoplatform Operative From 300 to 2000 K Based on Er3+ Emission and Blackbody Radiation
Mengistie L. Debasu, Duarte Ananias, Isabel Pastoriza-Santos, Luis M. Liz-Marzán, J. Rocha and Luís D. Carlos
Article first published online: 21 MAY 2013 | DOI: 10.1002/adma.201300892
A single nanoplatform integrating laser-induced heat generation by gold nanoparticles and temperature sensing up to 2000 K via (Gd,Yb,Er)2O3 nanorods is demonstrated, which presents considerable potential for nanoscale photonics and biomedicine. Blackbody emission is ascertained from the temperature increment with AuNPs concentration, emission color coordinates as a function of the laser pump power, and Planck's law of blackbody radiation.
- High Performance Field-Effect Ammonia Sensors Based on a Structured Ultrathin Organic Semiconductor Film
Liqiang Li, Peng Gao, Martin Baumgarten, Klaus Müllen, Nan Lu, Harald Fuchs and Lifeng Chi
Article first published online: 21 MAY 2013 | DOI: 10.1002/adma.201301138
High performance organic field-effect transistor (OFET)-based ammonia sensors are demonstrated with ultrathin (4–6 molecular layers) dendritic microstripes of an organic semiconductor prepared via dip-coating. These sensors exhibit high sensitivity, fast response/recovery rate, good selectivity, low concentration detection ability, and reliable reversibility, as well as stability. Such a performance represents great progress in the field of OFET-based sensors.
- Magnetic Coupling of Porphyrin Molecules Through Graphene
Christian F. Hermanns, Kartick Tarafder, Matthias Bernien, Alex Krüger, Yin-Ming Chang, Peter M. Oppeneer and Wolfgang Kuch
Article first published online: 21 MAY 2013 | DOI: 10.1002/adma.201205275
X-ray magnetic circular dichroism (XMCD) measurements and density functional theory (DFT)+U calculations reveal an unexpected antiferromagnetic coupling between physisorbed paramagnetic Co-porphyrin molecules and a Ni surface, separated by a graphene layer. A positive magnetization at the Ni substrate atoms is mediated by graphene and induces a negative one at the Co site, despite only a very small overlap between macrocyclic π and graphene pz-orbitals.