Manipulative Synthesis of Multipod Frameworks for Self-Organization and Self-Amplification of Cu<sub>2</sub>O Microcrystals

and, Yu Chang; Zeng, Hua Chun

doi:10.1021/cg034146w

Cited by 180 publications

(94 citation statements)

References 32 publications

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“…Among the morphology-controlled syntheses of inorganic oxides, cuprous oxide (Cu 2 O) has been widely investigated due to its ease of preparation. [4][5][6][7][8] The morphology-dependent photocatalytic and antibacterial properties of Cu 2 O were also studied recently. Figure 1 shows the X-ray diffraction (XRD) patterns of Ag 2 O prepared using different amounts of AgNO 3 with 1.0/ 40/10 molar ratios of AgNO 3 /pyridine/NaOH, respectively.…”

Section: -3mentioning

confidence: 99%

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Kim¹,

Kim²,

Park³

et al. 2011

Bulletin of the Korean Chemical Society

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The selective synthesis of inorganic oxides with unique morphology has attracted considerable interest because of their morphology-dependent properties and applications. 1-3Efforts on most synthetic inorganic oxides have been focused on preparing a stable morphology rather than providing a strategy for producing various morphologies. Therefore, well-controlled methods for synthesizing inorganic oxides with a systematic evolution of morphology should be developed by adjusting the experimental conditions. Among the morphology-controlled syntheses of inorganic oxides, cuprous oxide (Cu 2 O) has been widely investigated due to its ease of preparation.4-8 The morphology-dependent photocatalytic and antibacterial properties of Cu 2 O were also studied recently.9-11 Although Cu 2 O and silver oxide (Ag 2 O) have similar cubic crystal structures, relatively little is known about the morphology-controlled synthesis and physical properties of Ag 2 O.12,13 To date, a study of the morphology-dependent antibacterial effect of Ag 2 O has reported only for different polyhedral shapes including octahedrons, truncated octahedrons, and cubes.14 This study provided a simple precipitation method for the morphological evolution of Ag 2 O from cubes to octapods. Furthermore, the morphology-dependent antibacterial activity of Ag 2 O against E. coli was also examined.Ag 2 O products with various morphologies were prepared from a silver-pyridine (Py) complex solution. Figure 1 shows the X-ray diffraction (XRD) patterns of Ag 2 O prepared using different amounts of AgNO 3 with 1.0/ 40/10 molar ratios of AgNO 3 /pyridine/NaOH, respectively. All peaks corresponded to those reported for bulk Ag 2 O (JCPDS 12-0793, a = 0.4736 nm) with a cubic structure and impurities. Figure 2 shows scanning electron microscopy (SEM) images of Ag 2 O prepared with different amounts of AgNO 3 . At 2.5 mL of AgNO 3 , Ag 2 O formed a regular cubic shape, as shown in Figure 2(a). The mean length of each side was 600 nm. At 5.0 mL of AgNO 3 , Ag 2 O formed a cubic shape, and the mean length of each side was 700 nm. Void spaces were created at the center of the cubic crystal planes, as shown in Figure 2 (b). When the amount of AgNO 3 was increased to 7.5 mL, the void spaces at the center of the cubic crystal planes increased further, as shown in Figure 2(c). As the amount of AgNO 3 was increased up to 20 mL, octapods with eight identical Ag 2 O horns were formed (Figure 2(d)).

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Section: -3mentioning

confidence: 99%

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Kim¹,

Kim²,

Park³

et al. 2011

Bulletin of the Korean Chemical Society

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“…Self-organization, self-amplification and shape evolution in microcrystalline growth of Cu 2 O has been reported recently [5,6]. Cu 2 O thin films are prepared by many deposition techniques such as thermal oxidation [7], chemical deposition [8], reactive magnetron sputtering [9], pulsed laser deposition [10], plasma evaporation [11], electrodeposition [12,13], and among them electrodeposition is attractive because of its simplicity, low cost and low-temperature process.…”

Section: Introductionmentioning

confidence: 99%

Effects of annealing on the properties and structure of electrodeposited semiconducting Cu–O thin films

Wijesundera

Hidaka²,

Koga

et al. 2007

Physica Status Solidi (b)

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The structures and the electronic states in electrodeposited semiconductor Cu -O thin films have been investigated for each annealing temperature (T A ) by X-ray diffraction (XD) and X-ray absorption spectroscopy (XAS) near the Cu K edge using synchrotron radiation. The thin films prepared as grown and annealed at T A ≤ 175 °C, 200 °C ≤ T A ≤ 300 °C, T A = 400 °C are characterized mainly by the pure Cu 2 O-type structure, the pseudo-Cu 2 O-type having a superlattice structure, and two phases of Cu 2 O-type and CuOtype structures, respectively, while the film annealed at T A = 500 °C is single-phase CuO-type. The XAS spectra suggest that there is a structural phase transition occurring at about 400 °C, which induces a modulation of the local structure around Cu ions observed in the extended X-ray absorption fine structure (EXAFS) and the occupational electronic band states of Cu-4p localized just above the Fermi level, taken from X-ray absorption near edge structure (XANES). The open-circuit voltage suggests that the photosensitivity of the Cu -O thin films strongly depends on the annealing treatment and shows a crossover from an n-type to a p-type semiconductor.

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“…[24] Many recent efforts have been devoted to the shape-controlled synthesis of Cu 2 O micro-and nanocrystals. Systematic manipulation of the morphology and architecture of Cu 2 O microcrystals has been achieved using solution routes [25][26][27] and electrodeposition methods.…”

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confidence: 99%

One‐Pot Synthesis of Octahedral Cu₂O Nanocages via a Catalytic Solution Route

et al. 2005

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lithography process, using the increase in the T g of the photoresist particles caused by UV-induced crosslinking. Subsequent deposition of silica through the patterned-colloidal mask yielded ordered domains of nanoscale-hole arrays on a micrometer length scale. The present technique produces a spatially organized mask with multiple length scales for colloidal lithography. As such, various functional materials can be deposited through these multiscale colloidal masks, fabricating nanopatterned substrates, which are of practical significance in a wide range of applications from biosensors to optoelectronic devices. ExperimentalSynthesis of Photoresist Particles: MMA (Aldrich, > 99 %) and GMA (Aldrich, > 95 %) were used as supplied. Potassium persulfate (KPS) was used as an initiator for emulsion polymerization. A 100 mL two-necked round-bottom flask was filled with KPS dissolved in 50 mL of distilled water, and a monomer mixture of MMA and GMA. The content of KPS was fixed at 1 wt.-%. The content of GMA was varied in the range 5-30 wt.-% of the total monomer content, which was fixed at 10 wt.-%. The system was kept under a nitrogen atmosphere and the reaction mixture was stirred magnetically at 300 rpm. When the KPS was dissolved completely, the mixture was heated to 75°C using an oil bath. After 12 h, the mixture was separated by centrifugation and was purified with distilled water several times. The size of the particles, measured by SEM, ranged from 360 to 420 nm. Later, the cationic photoinitiator, Irgacure 250, was introduced to the photoresist particles by spin-coating.Measurement of T g : The glass-transition temperatures of the UV-exposed and UV-screened poly(MMA-co-GMA) particles were determined using a differential scanning calorimeter (DSC, TA Instruments, Q1000) under a nitrogen atmosphere at a heating rate of 10°C min -1 . To measure the T g of UV-exposed particles, the particles were fully baked at 150°C for 2 h after UV exposure, because the crosslinking reaction could proceed during the DSC measurement. Therefore, the measured T g could be higher than the T g of the UV-exposed particles in the patterning. Meanwhile, T g of the UV-screened particles was compared with that estimated using the rule-of-mixtures theory where T g = 115°C for polyMMA and T g = 75°C for polyGMA [19].Deposition of Silica: Silica was deposited in a batch reactor under atmospheric pressure at room temperature. The sample was sequentially exposed to water vapor for 30 min, dried in argon gas for purging the reactor, and then SiCl 4 vapor for 20 min. The reactant vapors were carried by argon gas under atmospheric pressure. The concentration of SiCl 4 was 0.05 vol.-% in moisture-free argon gas and the relative humidity of water vapor was 50 %. (Caution: silicon tetrachloride is a very corrosive liquid. Use it only with adequate ventilation, and wear protective clothing and safety goggles.) The thickness of the silica layer was controlled by the exposure time to the precursor vapor and around 50 nm for 30 min exposure was obtained.

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Manipulative Synthesis of Multipod Frameworks for Self-Organization and Self-Amplification of Cu₂O Microcrystals

Cited by 180 publications

References 32 publications

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Effects of annealing on the properties and structure of electrodeposited semiconducting Cu–O thin films

One‐Pot Synthesis of Octahedral Cu₂O Nanocages via a Catalytic Solution Route

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Manipulative Synthesis of Multipod Frameworks for Self-Organization and Self-Amplification of Cu2O Microcrystals

Cited by 180 publications

References 32 publications

Morphological Evolution of Ag2O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Morphological Evolution of Ag2O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Effects of annealing on the properties and structure of electrodeposited semiconducting Cu–O thin films

One‐Pot Synthesis of Octahedral Cu2O Nanocages via a Catalytic Solution Route

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Manipulative Synthesis of Multipod Frameworks for Self-Organization and Self-Amplification of Cu₂O Microcrystals

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

Morphological Evolution of Ag₂O Microstructures from Cubes to Octapods and Their Antibacterial Activities

One‐Pot Synthesis of Octahedral Cu₂O Nanocages via a Catalytic Solution Route