Degenerately Hydrogen Doped Molybdenum Oxide Nanodisks for Ultrasensitive Plasmonic Biosensing

Zhang, Baoyue; Zavabeti, Ali; Chrimes, Adam F.; Haque, Farjana; O’Dell, Luke A.; Khan, Hareem; Syed, Nitu; Datta, Robi S.; Wang, Yichao; Chesman, Anthony S. R.; Daeneke, Torben; Kalantar‐zadeh, Kourosh; Ou, Jian Zhen

doi:10.1002/adfm.201706006

Cited by 113 publications

(111 citation statements)

References 73 publications

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“…As the concentration of IPA increases, the peak intensity at 532.3 eV associated with the surface oxygen gradually increases for SM7, SM5, and SM3 films, accompanied by a peak shift to 532.6 eV. Particularly for SM5 and SM3 films, the surface oxygen peak intensity becomes much more pronounced than that of lattice oxygen, which indicates that the surfaces of SM5 and SM3 films mainly consist of Mo 5+ —OH bonds induced by the hydroxyl group from IPA, which is responsible for changes in oxidation states in the SM during film formation.…”

Section: Resultsmentioning

confidence: 95%

Solution‐Processed Molybdenum Oxide with Hydroxyl Radical‐Induced Oxygen Vacancy as an Efficient and Stable Interfacial Layer for Organic Solar Cells

et al. 2019

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The interfacial layer (IL) in organic solar cells (OSCs) can be an important boosting factor for improving device efficiency and stability. Herein, a facile and cost‐effective approach to form a uniform molybdenum oxide (MoO3) film with desirable stability is provided, based on solution processing at low temperatures by simplified precursor solution synthesis. The solution‐processed MoO3 (SM) film, with oxygen vacancies induced by the hydroxyl group, functions as an efficient anode IL in conventional OSCs. The hole‐transporting performance of SM is well demonstrated in nonfullerene‐based OSCs exhibiting over 10% of power conversion efficiency. The enhanced device performance of SM‐based OSCs over that of poly(3,4‐ethylene dioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) is investigated by analyzing the morphology, electronic state, and electrical conductivity of such a hole‐transporting layer, as well as the charge dynamics in the completed devices. Furthermore, the high stability of the SM films in OSCs is examined under various environmental conditions, including long‐term and thermal stability. In particular, fullerene‐based OSCs with SM maintain over 90% of their initial cell performance over 2500 h under inert conditions. It is shown that solution‐processed metal oxides can be viable ILs with high functionality and versatility, overcoming the drawbacks of conventionally adopted conducting polymer interlayers.

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Section: Resultsmentioning

confidence: 95%

Solution‐Processed Molybdenum Oxide with Hydroxyl Radical‐Induced Oxygen Vacancy as an Efficient and Stable Interfacial Layer for Organic Solar Cells

et al. 2019

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“…We then further examined the O 1s XPS spectra of the H X MoO 3 samples (Figure 4b). For all the products, an intense peak at 530.5 eV was attributed to the MoO group 46. A peak at 532.3 eV in 6 h‐H X MoO 3 suggested the formation of the peroxo group47 and this peak disappeared as the reaction time increased.…”

Section: Figurementioning

confidence: 96%

Flexible All‐Solution‐Processed Organic Solar Cells with High‐Performance Nonfullerene Active Layers

et al. 2020

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All‐solution‐processed organic solar cells (from the bottom substrate to the top electrode) are highly desirable for low‐cost and ubiquitous applications. However, it is still challenging to fabricate efficient all‐solution‐processed organic solar cells with a high‐performance nonfullerene (NF) active layer. Issues of charge extraction and wetting are persistent at the interface between the nonfullerene active layer and the printable top electrode (PEDOT:PSS). In this work, efficient all‐solution‐processed NF organic solar cells (from the bottom substrate to the top electrode) are reported via the adoption of a layer of hydrogen molybdenum bronze (HXMoO3) between the active layer and the PEDOT:PSS. The dual functions of HXMoO3 include: 1) its deep Fermi level of −5.44 eV can effectively extract holes from the active layer; and 2) the wetting issues of the PEDOT:PSS on the hydrophobic surface of the NF active layer can be solved. Importantly, fine control of the HXMoO3 composition during the synthesis is critical in obtaining processing orthogonality between HXMoO3 and the PEDOT:PSS. Flexible all‐solution‐processed NF organic solar cells with power conversion efficiencies of 11.9% and 10.3% are obtained for solar cells with an area of 0.04 and 1 cm2, respectively.

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“…We take MoO 3 as an example. Kalantar‐Zadeh and co‐workers reported that the plasmon resonance wavelengths of 2D H x MoO 3 nanodisks can be tuned in the range from visible to near‐infrared by intercalated H + concentration . H doping not only reduces the Mo oxidation state, but also induces a large number of free electrons.…”

Section: Electromagnetic Responsesmentioning

confidence: 99%

Electromagnetic Functions of Patterned 2D Materials for Micro–Nano Devices Covering GHz, THz, and Optical Frequency

Zhang

Wang

Cao

et al. 2019

Advanced Optical Materials

114

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of 2D materials, understanding electromagnetic responses and exploiting abundant strategies to control electromagnetic wave are urgently needed for developing devices. [16][17][18] Patterned structures offer a platform to develop the potential of 2D materials deeply, and even break through some limits of traditional 2D materials. Geometric structures based on such crystals increase the freedom to manipulate electromagnetic wave, giving 2D materials infinite vitality. Recently, micro-nano devices integrated with patterned graphene, MXenes, MoS 2 , WS 2 , or black phosphorus are refreshing human being's cognition, pushing micro-nano devices into a new level. [19][20][21][22][23][24] However, there is still broad space for improvement. Designing a high-performance micro-nano device remains a great challenge. Selecting materials based on the intrinsic nature, arranging layout, tailoring patterned structures, choosing fabrication methods, as well as knowing physical mechanism of devices are all key links in designing a prominent device.Intellectualization, multifunction, automation, or high integration is an inevitable trend in various devices. Reasonable utilization of physical effects to improve performance, optimize figure of merit, and integrate multiple functionalities are becoming the theme of micro-nano devices. Herein, we start from the crystal and electronic structures of several typical 2D materials to summarize the available physical effects and electromagnetic response behaviors. We highlight the progress in preparing patterned 2D materials, and emphasize the mechanism of the micro-nano devices to broaden the horizons for designing devices. Finally, we predict future directions of fabrication techniques and point out the problems in current devices. Electronic Structures and Available Physical Effects of a 2D CrystalCrystal and electronic structures codetermine the properties of materials. Crystal structure, including constituent elements, 2D materials strongly drive the development of micro-nano devices, and patterned structures based on such crystals bring new opportunities. The advanced fabrication techniques of patterned 2D materials and the analysis of their electronic structures, and physical properties to provide access to diverse applications are discussed. Special attention is given to the hotspot electromagnetic functions and devices based on patterned 2D materials, including photodetectors, optoelectronic switches, modulators, polarization converters, gratings, as well as electromagnetic wave attenuation devices. Finally, a systematical outlook on the development of patterned 2D materials in micro-nano devices is presented, pointing out the current problems and exploring the most promising directions in the future. Patterned 2D Materials

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Degenerately Hydrogen Doped Molybdenum Oxide Nanodisks for Ultrasensitive Plasmonic Biosensing

Cited by 113 publications

References 73 publications

Solution‐Processed Molybdenum Oxide with Hydroxyl Radical‐Induced Oxygen Vacancy as an Efficient and Stable Interfacial Layer for Organic Solar Cells

Solution‐Processed Molybdenum Oxide with Hydroxyl Radical‐Induced Oxygen Vacancy as an Efficient and Stable Interfacial Layer for Organic Solar Cells

Flexible All‐Solution‐Processed Organic Solar Cells with High‐Performance Nonfullerene Active Layers

Electromagnetic Functions of Patterned 2D Materials for Micro–Nano Devices Covering GHz, THz, and Optical Frequency

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