Photodissociation of mass-selected bismuth/chromium and bismuth/iron bimetallic clusters

Taylor, T. G.; Willey, K. F.; Bishop, M. B.; Duncan, M. A.

doi:10.1021/j100384a007

Cited by 30 publications

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“…It is found that the stable configuration of the Ag 7 Au 6 cluster is Au surface-segregated hollow structures with symmetry of C 3v , which is in agreement with the trends of the family of 13-atom Au−Ag clusters. 25 Chen et al 25 have observed a family of Au surface-segregated structures for core−shell Ag n Au 13−n (n = 1, 2, 3, 5, 7,8,9,12) and hollow Ag n Au 13−n (n = 4, 6, 10, 11) clusters, whose stability is enhanced by directional charge transfer. However, the most stable structure we obtained is different from that of Chen et al, 25 which is a hollow structure with symmetry of C 1 .…”

Section: Resultsmentioning

confidence: 99%

“…Bimetallic nanoclusters (also called “nanoalloys”) are of great interest from both the fundamental and the technological points of view not only because of their new degrees of freedom for understanding their electronic and geometric properties of clusters but also because of their potential applications in catalysis, − optics, − nanoelectronics, and sensing . In particular, silver–gold (Ag–Au) clusters have been investigated extensively from a computational point of view − as well as experimentally. − Their unique physicochemical properties depend on the shape and structure of the clusters, the surface segregation of the clusters, and the alloying extent or atomic distribution in nanoclusters.…”

Section: Introductionmentioning

confidence: 99%

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Ag₇Au₆ Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Yong

et al. 2015

J. Phys. Chem. C

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Ag−Au bimetallic clusters have demonstrated extreme sensitivity, which can be theoretically explained by the conductivity change of the clusters induced by the absorption process, to molecules such as CO, H 2 S, and so forth. Recently, a 13-atom alloy quantum cluster (Ag 7 Au 6 ) has been experimentally synthesized and characterized. Here, the adsorption of CO, HCN, and NO on the Ag 7 Au 6 cluster was investigated using density functional theory calculations in terms of geometric, energetic, and electronic properties to exploit its potential applications as gas sensors. It is found that the CO, HCN, and NO molecules can be chemisorbed on the Ag 7 Au 6 cluster with exothermic adsorption energy (−0.474 ∼ −1.039 eV) and can lead to finite charge transfer. The electronic properties of the Ag 7 Au 6 cluster present dramatic changes after the adsorption of the CO, HCN, and NO molecules, especially its electric conductivity. Thus, the Ag 7 Au 6 cluster is expected to be a promising gas sensor for CO, HCN, and NO detection. ■ INTRODUCTIONThe environmental gas monitoring and controlling is now recognized as an important issue for our safety and health. Much research has been focused on the development of suitable gas-sensitive materials for continuous monitoring and setting off alarms for hazardous chemical vapors present beyond specified levels. 1−4 Chemical gases such as CO, HCN, and NO are highly toxic to human beings and animals as they inhibit the consumption of oxygen by body tissues. They are colorless, odorless, and tasteless, and thus human beings do not have timely alertness to their presence. For example, exposure levels of 100 ppm of HCN which would result in death are about 1 h or less in some cases, while exposure levels of 500 ppm of HCN are within 15 min. 5 Higher concentration levels will result in faster onset of symptoms or death. Therefore, effective methods for sensing these three toxic gases are highly desired.Bimetallic nanoclusters (also called "nanoalloys" 6 ) are of great interest from both the fundamental and the technological points of view not only because of their new degrees of freedom for understanding their electronic and geometric properties of clusters but also because of their potential applications in catalysis, 7−11 optics, 12−14 nanoelectronics, 15 and sensing. 16 In particular, silver−gold (Ag−Au) clusters have been investigated extensively from a computational point of view 17−27 as well as experimentally. 28−37 Their unique physicochemical properties depend on the shape and structure of the clusters, the surface segregation of the clusters, and the alloying extent or atomic distribution in nanoclusters. Recently, Ag−Au clusters are investigated as potential catalysts or sensors for removal and detection of toxic molecules. In this regard, adsorption of toxic molecules on Ag−Au clusters has attracted several theoretical and experimental studies. 38−45 Experimental investigations on CO adsorption on Au n Ag m (n = 10−45, m = 0, 1, 2) clusters at 140 K indicate that the CO molecule a...

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Ag₇Au₆ Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Yong

et al. 2015

J. Phys. Chem. C

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“…While the vast majority of experimental cluster research has focused on the structural, electronic, and chemical properties of homonuclear clusters, several studies of heteronuclear clusters of transition metal elements, main group metal elements, semiconductor elements, or some combination thereof have been performed. In particular, the abundance distributions of Ni n Cr m and Ni n Al m were examined to explain the growth patterns of these clusters, and photodissociation was applied to Bi n Fe m , Bi n Cr m , and Fe n Ag m to investigate the intermetallic bonding. Also, among the notable developments, the reactivities of Co n Al m and Co n V m with H 2 were probed, and the ionization potentials of Co n Al m , and Co n V m were measured to provide information on the electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Reactivity and Photoionization Studies of Bimetallic Cobalt−Manganese Clusters

et al. 1999

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The reactivity of selected Co n Mn m (8 ≤ m + n ≤ 23) clusters with N2 and the vertical ionization potentials (IPs) of selected Co n Mn m (8 ≤ m + n ≤ 31) clusters have been measured. No obvious correlation is found between the reactivities and the IPs. Inferences about cluster structure may be made from the nitrogen uptake data. In particular, whereas pure cobalt clusters tend to adopt structures having bulk packing, incorporation of manganese atoms into the cluster shifts the relative energies of close-lying isomers to favor an icosahedral growth sequence. For many cluster sizes, the maximum number of nitrogen molecules adsorbed on a cluster at −80 °C is equal to the number of cobalt atoms on the surface of the cluster, thereby giving insight into the cluster structure and the locations of the individual cobalt and manganese atoms in these bimetallic species.

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“…Photodissociation of a variety of pure metal cluster ions and alloy cluster ions have been described by our research group (15)(16)(17)(18)(19). Figure 3 provides two selected examples which illustrate the general kinds of mechanisms we observe.…”

Section: Pure Metal Clustersmentioning

confidence: 99%

Cluster—Ion Photodissociation and Spectroscopy in a Reflectron Time-of-Flight Mass Spectrometer

Willey

Robbins

Yeh

et al. 1993

ACS Symposium Series

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We describe a configuration for a reflectron time-of-flight mass spectrometer incorporating laser photodissociation of mass--selected ions, and the application of this instrument to studies of metal-containing cluster ions. Metal cluster cations and metal--containing ion-molecule complexes are produced in a molecular beam with a pulsed-nozzle cluster source. We describe here details of the instrument operation for studies of these systems. They exhibit novel cluster photochemistry and vibrationally resolved cluster ion spectroscopy. Advantages and disadvantages of this instrument are discussed.As reflected in this volume, time-of-flight (TOF) spectrometers have many important advantages for modern mass spectrometry. They are ideally suited for experiments employing pulsed laser ionization, ablation, or desorption. The multichannel aspect of mass analysis and ion detection allows rapid data acquisition and processing. It is therefore possible to couple TOF devices to instrument systems requiring fast and repetitive on-line analysis. While TOF systems have historically had poorer resolution than many other mass spectrometers, the introduction of the reflectron time-of-flight (RTOF) design has improved resolution so that it is now acceptable for many applications (1-7). Perhaps the greatest advantage of TOF systems is their high mass range. While most magnetic or electrostatic field instruments are restricted to charge-to-mass ratios of less than 10-20 kDa, TOF instruments now routinely detect species in the range of several hundred kDa. This capability is essential for analysis problems involving high molecular weight polymers, biological molecules, or other novel materials.A serious disadvantage of TOF and RTOF instruments until recently has been the difficulty in utilizing these instruments for tandem mass spectrometry

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Photodissociation of mass-selected bismuth/chromium and bismuth/iron bimetallic clusters

Cited by 30 publications

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Ag₇Au₆ Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Ag₇Au₆ Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Reactivity and Photoionization Studies of Bimetallic Cobalt−Manganese Clusters

Cluster—Ion Photodissociation and Spectroscopy in a Reflectron Time-of-Flight Mass Spectrometer

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Photodissociation of mass-selected bismuth/chromium and bismuth/iron bimetallic clusters

Cited by 30 publications

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Ag7Au6 Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Ag7Au6 Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Reactivity and Photoionization Studies of Bimetallic Cobalt−Manganese Clusters

Cluster—Ion Photodissociation and Spectroscopy in a Reflectron Time-of-Flight Mass Spectrometer

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Ag₇Au₆ Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection

Ag₇Au₆ Cluster as a Potential Gas Sensor for CO, HCN, and NO Detection