Localized Electroless Ag Plating at a Tip Apex for Scanning Kelvin Probe Microscopy

Lin, Chun-Ting; Yu, Ming-Han; Su, Jung‐Jeng; Chen, Po-Li; Shiao, Ming‐Hua; Nemcsics, Ákos; Chang, Min-Kuan

doi:10.7567/jjap.52.06gf03

Cited by 7 publications

(6 citation statements)

References 31 publications

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“…In the first step of GRR, a fluoride-assisted GRR (FAGRR) [30] was adopted to prepare the Ag dendritic nanoforests (Ag DNFs) on planar silicon. In a typical process, n-type silicon (2 cm × 2 cm) was dipped into 2.5 mM silver nitride (AgNO3) + 25% (v /v ) buffered oxide etchant (BOE) (comprising 34% NH4F and 7% HF) for 5 min at ambient.…”

Section: Preparation Of Ag Dnfs and Pt-ag Tdnfsmentioning

confidence: 99%

“…The prepared catalysts suspended in the solution could be hardly collected and deposited on the electrodes in the electrochemical cells. Moreover, the effective electrochemical surface area of the non-supported catalysts could be greatly sacrificed due to the aggregation of nanocatalysts in brushing or printing process [4,26].In order to prepare metallic nanostructures directly on supporting substrates, fluoride-assisted Galvanic replacement reaction (FAGRR) was proposed to synthesize threedimensional metallic dendrites on silicon-based substrates [27][28][29][30][31]. Recently, Ye et al reported a facile method for preparing self-assembled silver dendrites on silicon wafer in fluoride and silver nitride solution [27,29] for improving surface-enhanced Raman spectroscopy (SERS) [27][28][29]31].…”

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confidence: 99%

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A facile approach to prepare silicon-based Pt-Ag tubular dendritic nano-forests (tDNFs) for solar-light-enhanced methanol oxidation reaction

Lin¹,

Shiao²,

Chang³

et al. 2016

Nano Online

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which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited.In this paper, a facile two-step Galvanic replacement reaction (GRR) is proposed to prepare Pt-Ag tubular dendritic nano-forests (tDNFs) in ambient condition for enhancing methanol oxidation reaction (MOR) under solar illumination. In the first GRR, a homogeneous layer of silver dendritic nano-forests (DNFs) with 10 μm in thickness was grown on Si wafer in 5 min in silver nitride (AgNO3) and buffer oxide etchant (BOE) solution. In the second GRR, we utilized chloroplatinic acid (H2PtCl6) as the precursor for platinum (Pt) deposition to further transform the prepared Ag DNFs into Pt-Ag tDNFs. The catalytic performance and solar response of the Pt-Ag tDNFs toward methanol electro-oxidation are also studied by cyclic voltammetry (CV) and chronoamperometry (CA). The methanol oxidation current was boosted by 6.4% under solar illumination on the Pt-Ag tDNFs due to the induced localized surface plasmon resonance (LSPR) on the dendritic structure. Current results provide a cost-effective and facile approach to prepare solar-driven metallic electrodes potentially applicable to photo-electro-chemical fuel cells.Keywords: Direct methanol fuel cell; Galvanic replacement reaction; Tubular dendritic nano-forests BackgroundDirect methanol fuel cell (DMFC) has been deemed as one of the important power suppliers for renewable power applications due to the high energy-conversion efficiency thereof [1,2]. One of the major issues of DMFCs is the slow process of methanol oxidation reaction (MOR), which directly limits the efficiency of DMFC [ 3]. Traditionally, platinum (Pt)-based alloy has been used as common a catalyst in MOR. In the past two decades, many bimetallic catalysts have been proposed to enhance the efficiency , were proposed to boost methanol oxidation under ultraviolet (UV) illumination for photo-electrochemical fuel cells [9]. Although over 60% of enhancement on MOR has been realized under UV illumination (365 nm, 100 W) [8], seldom, reports discussed the solar enhancement toward MOR, especially on pure metallic catalysts. In this paper, a facile two-step Galvanic replacement reaction (GRR) is proposed to prepare Pt-Ag tubular dendritic nano-forests (tDNFs) in ambient condition for enhancing MOR under solar illumination.In preparation of the aforementioned bimetallic catalysts, GRR was widely employed to provide a simple and cost-effective fabrication approach [10,11]. By utilizing the difference in the standard reduction potentials, replacement between two metals can be easily achieved at ambient condition. Many metal composites prepared by GRR have been reported, including Ag-Au [12,13], Pt-Au [14,15], 17], , Pd-Ag [22,23], , and Cu-Ag [25]. However, most of the studies focused on the preparation of non-supported catalysts. The prepared catalysts suspended in the solution could be hardly collected and deposited on the electrodes in the electrochemical cells. Moreover, the effective electroc...

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Section: Preparation Of Ag Dnfs and Pt-ag Tdnfsmentioning

confidence: 99%

mentioning

confidence: 99%

A facile approach to prepare silicon-based Pt-Ag tubular dendritic nano-forests (tDNFs) for solar-light-enhanced methanol oxidation reaction

Lin¹,

Shiao²,

Chang³

et al. 2016

Nano Online

Self Cite

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“…However, the spatial resolution was seriously limited because of the stray-field generated by the metallic coating [ 7 – 9 ]. To reduce this stray-field phenomenon, many nanostructures have been proposed for tip modifications, including carbon nanotube [ 10 – 12 ], Pt nanowire [ 13 ], single metallic nanoparticle (NP) [ 14 , 15 ], etc. Moreover, for many decades, electron beam induced deposition (EBID) has been a major approach for tip modification [ 16 – 19 ].…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, the development of nonvacuum technology for tip modifications has been presented. Electrodeposition [ 15 ] and electroless deposition [ 14 ] are both feasible approaches for tip modification under ambient conditions. Recently, we successfully prepared an apex of an Ag NP-modified silicon tip (Ag tip) by utilizing a localized fluoride-assisted galvanic replacement reaction (LFAGRR), which provides a facile and cost-effective process for tip modification [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

“…Electrodeposition [ 15 ] and electroless deposition [ 14 ] are both feasible approaches for tip modification under ambient conditions. Recently, we successfully prepared an apex of an Ag NP-modified silicon tip (Ag tip) by utilizing a localized fluoride-assisted galvanic replacement reaction (LFAGRR), which provides a facile and cost-effective process for tip modification [ 14 ]. However, the instability of Ag under ambient conditions directly limits the commercialization of the Ag tips [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

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Facile Preparation of a Platinum Silicide Nanoparticle-Modified Tip Apex for Scanning Kelvin Probe Microscopy

Lin

Chen

et al. 2015

Nanoscale Res Lett

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In this study, we propose an ultra-facile approach to prepare a platinum silicide nanoparticle-modified tip apex (PSM tip) used for scanning Kelvin probe microscopy (SKPM). We combined a localized fluoride-assisted galvanic replacement reaction (LFAGRR) and atmospheric microwave annealing (AMA) to deposit a single platinum silicide nanoparticle with a diameter of 32 nm on the apex of a bare silicon tip of atomic force microscopy (AFM). The total process was completed in an ambient environment in less than 3 min. The improved potential resolution in the SKPM measurement was verified. Moreover, the resolution of the topography is comparable to that of a bare silicon tip. In addition, the negative charges found on the PSM tips suggest the possibility of exploring the use of current PSM tips to sense electric fields more precisely. The ultra-fast and cost-effective preparation of the PSM tips provides a new direction for the preparation of functional tips for scanning probe microscopy.

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On the shape formation of the droplet epitaxial quantum dots

Nemcsics

2016

Microelectronics Reliability

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Localized Electroless Ag Plating at a Tip Apex for Scanning Kelvin Probe Microscopy

Cited by 7 publications

References 31 publications

A facile approach to prepare silicon-based Pt-Ag tubular dendritic nano-forests (tDNFs) for solar-light-enhanced methanol oxidation reaction

A facile approach to prepare silicon-based Pt-Ag tubular dendritic nano-forests (tDNFs) for solar-light-enhanced methanol oxidation reaction

Facile Preparation of a Platinum Silicide Nanoparticle-Modified Tip Apex for Scanning Kelvin Probe Microscopy

On the shape formation of the droplet epitaxial quantum dots

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