Coordination-Controlled C–C Coupling Products via <i>ortho</i>-Site C–H Activation

Zhang, Xue; Xue, Na; Li, Chao; Li, Na; Wang, Hao; Kocić, Nemanja; Beniwal, Sumit; Palotás, Krisztián; Li, Ruoning; Xue, Qi‐Kun; Maier, Sabine; Hou, Shimin; Wang, Yongfeng

doi:10.1021/acsnano.8b06885

Cited by 76 publications

(100 citation statements)

References 66 publications

(94 reference statements)

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“…The latter was explained due to more dorbital-vacancies (VIB-VIIB group) and subsequently high binding energy of carbon to d-orbital vacancies supporting the formation of surface carbides. [210] This observation is likely to correlate with the standard formation enthalpy of the related carbides.…”

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 81%

“…In terms of a first comprehensive, correlative study, Zhang and co-workers recently studied the ns-laser ablation of 16 different transition metals in acetone, to investigate the resulting nanostructures by means of XRD and HR-TEM. [210] In case of transition metals with a positive standard potential (e. g. Au, Pt, Pd, Ag, Cu), mainly elementary nanoparticles are obtained (with carbon shell, see Figure 9b-d), while the formation of surface carbides is observed in case of ignoble transition metals. The latter was explained due to more dorbital-vacancies (VIB-VIIB group) and subsequently high binding energy of carbon to d-orbital vacancies supporting the formation of surface carbides.…”

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 98%

“…In order to reduce or even suppress surface oxidation [108,125,[209][210][211][212][213][214] and related oxide-or hydroxide morphologies, as well as oxidation-induced segregation in multi-metallic nanoparticles, [32,58,198,215] LSPC in organic solvents has been further developed during the recent years. Commonly, these nanoparticles gained from LAL in organic solvents are covered with a graphitic carbon-shell potentially originating from solvent decomposition or pyrolysis during LAL.…”

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 99%

“…[213] While the latter eventually is the source for carbideformation (in line with ref. [210]) it was further proposed that the excess of dissolved carbon precipitates onto the surface of the forming particle during the subsequent cooling stage. [213] Consequently, for 3 particles observed in this study, the authors found a low number of carbon shells in case of smaller nanoparticles, and vice versa.…”

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 99%

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Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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Due to material gaps and synthesis‐related cross‐correlations in heterogeneous catalysis, chemists and physicists are constantly motivated to develop novel catalyst preparation methods for independent control of morphology, size, and composition. Within this article, advances, opportunities, and the current limits of laser‐based catalyst preparation technique, as well as synergies with conventional methods will be reviewed in terms of purity, particle size, morphology, composition, and nanoparticle‐support interaction. It will be shown, that the surfactant‐free particles represent ideal model materials to validate kinetic models and conduct parametric activity studies by independent adjustment of functional properties like nanoparticle size, composition, and load. Consequently, the importance of transient plasma dynamics tailoring nanoparticle formation will be pointed out, comparing experimental studies with own calculations and novel simulations taken from literature. Finally, perspectives of surfactant‐free colloidal nanoparticles for unrevealing active sites in heterogeneous catalysts are presented.

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Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 81%

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 98%

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 99%

Section: Carbon-covered Core-shell Nanostructuresmentioning

confidence: 99%

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Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

et al. 2019

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“…[16][17][18][19][20][21][22][23][24][25] Several approaches have been demonstrated to provide control over the polarity of s-SWNTs FETs. These approaches involve the use of specific dielectric materials, [26] the introduction of a barrier for one of the carriers by choosing adequate source-drain metal contacts, [27] the use of new device architectures, [28] and the introduction of an extra doping layer deposited on top of the s-SWNT active channel. [18,29] All these approaches, unfortunately, require additional fabrication steps, making them in some respect inconvenient.…”

mentioning

confidence: 99%

Customizing the Polarity of Single‐Walled Carbon‐Nanotube Field‐Effect Transistors Using Solution‐Based Additives

Salazar‐Rios

Sengrian

Talsma

et al. 2019

Adv Elect Materials

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Polarity control in semiconducting single‐walled carbon‐nanotube field‐effect transistors (s‐SWNT FETs) is important to promote their application in logic devices. The methods to turn the intrinsically ambipolar s‐SWNT FETs into unipolar devices that have been proposed until now require extra fabrication steps that make preparation longer and more complex. It is demonstrated that by starting from a highly purified ink of semiconducting single‐walled carbon nanotubes sorted by a conjugated polymer, and mixing them with additives, it is possible to achieve unipolar charge transport. The three additives used are benzyl viologen (BV), 4‐(2,3‐dihydro‐1,3‐dimethyl‐1H‐benzimidazol‐2‐yl)‐N,N‐dimethylbenzenamine (N‐DMBI), which give rise to n‐type field‐effect transistors, and 2,3,5,6‐tetrafluoro‐7,7,8,8‐tetracyanoquinodimethane (F4‐TCNQ) which gives rise to p‐type transistors. BV and N‐DMBI transform the s‐SWNTs transistors from ambipolar with mobility of the order of 0.7 cm2 V−1 s−1 to n‐type with mobility up to 5 cm2 V−1 s−1. F4‐TCNQ transform the ambipolar transistors in p‐type with mobility up to 16 cm2 V−1 s−1.

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Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

Fang

Yang

Adjokatse

et al. 2019

Adv Funct Materials

118

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2D perovskite materials have recently reattracted intense research interest for applications in photovoltaics and optoelectronics. As a consequence of the dielectric and quantum confinement effect, they show strongly bound and stable excitons at room temperature. Here, the band-edge exciton fine structure and in particular its exciton and biexciton dynamics in high quality crystals of (PEA) 2 PbI 4 are investigated. A comparison of bulk and surface exciton lifetimes yields a room temperature surface recombination velocity of 2 × 10 3 cm s −1 and an intrinsic lifetime of 185 ns. Biexciton emission is evidenced at room temperature, with a binding energy of ≈45 meV and a lifetime of 80 ps. At low temperature, exciton state splitting is observed, which is caused by the electron-hole exchange interaction. Transient photoluminescence resolves the low-lying dark exciton state, with a bright/dark splitting energy estimated to be 10 meV. This work contributes to the understanding of the complex scenario of the elementary photoexcitations in 2D perovskites. materials such as transition metal dichalcogenides, phosphorene, and graphene. They can be easily grown by both solution methods and vapor transport methods at low temperature, [14][15][16][17] with a tunable bulk direct bandgap. [18] These advantages make them appealing for future optoelectronic and photonic applications.Unlike their 3D counterparts, the dielectric and quantum confinement of carriers in the 2D perovskite layers gives rise to unusually strong excitonic effects. [19,20] It has been experimentally observed that excitons are tightly confined in the inorganic layers with binding energy as high as a few hundred millielectronvolts (significantly higher than that of 3D perovskites). [21] This greatly enhanced exciton binding energy makes them particularly interesting for light-emitting applications. [8,22] Moreover, 2D perovskites can exhibit a variety of multiexciton species, including biexcitons and trions. [20,23,24] The presence of these quasiparticles is exciting due to their unique role, leading to a better understanding of many body effects and their great promise for photonic applications. In addition, recent experiments reveal an important role of electron-phonon couplings on the exciton dynamics in 2D lead-iodide perovskite, suggesting a complex scenario for carrier relaxation and exciton formation. [25,26] It is therefore crucial to understand elementary photoexcitations in these layered materials. However, exciton fine structures and their properties are usually masked by local energy fluctuations resulting from disorder in thin films or broad emission due to the formation of self-trapped excitons. [27] Whereas their steady-state optical properties have

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Coordination-Controlled C–C Coupling Products via ortho-Site C–H Activation

Cited by 76 publications

References 66 publications

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Perspective of Surfactant‐Free Colloidal Nanoparticles in Heterogeneous Catalysis

Customizing the Polarity of Single‐Walled Carbon‐Nanotube Field‐Effect Transistors Using Solution‐Based Additives

Band‐Edge Exciton Fine Structure and Exciton Recombination Dynamics in Single Crystals of Layered Hybrid Perovskites

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