Zinc Oxide Nanorods Grown on Printed Circuit Board for Extended-Gate Field-Effect Transistor pH Sensor

Thanh, Pham Van; Nhu, Le Thi Quynh; Hong, Hanh; Tuyên, Nguyễn Việt; Doanh, Sai Cong; Viet, Nguyen Canh; Kien, Do Trung

doi:10.1007/s11664-017-5369-0

Cited by 22 publications

(14 citation statements)

References 38 publications

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“…The hydrothermal method has been widely used in producing ZnO nanostructures by using a simple, safe and low-cost technique on different kinds of substrates such as GaN, Si, sapphire, ITO and FTO. Recently, ZnO nanorods (NRs), nanotubes were successfully grown on Printed circuit board (PCB) substrate [8][9][10] which is costeffective, and commonly used in electronic circuit and optoelectronics devices. In this work, a seedless hydrothermal method was elevated by implementing a galvanic cell structure in non-saturated equimolar aqueous solutions of zinc nitrate hexahydrate (Zn[NO 3 ] 2 •6H 2 O) and hexamethylenetetramine (C 6 H 12 N 4 ) [9].…”

Section: Introductionmentioning

confidence: 99%

The influence of precursor concentration on the crystallinity and morphology of ZnO nanorods grown on the printed circuit board substrate

Hong

2020

2020 International Conference on Information Technology and Nanotechnology (ITNT)

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In this work, the influence of precursor concentration on the surface morphologies, and the crystallinity of ZnO nanorods (NRs) grown on printed circuit board substrates (PCBs) is presented. It was shown that by implementing a galvanic cell structure in an aqueous solution of equimolar concentration of zinc nitrate hexahydrate (Zn[NO3] 2 •6H 2 O) and hexamethylenetetramine (C 6 H 12 N 4), ZnO NRs can directly grow on the PCBs substrate without the assistance of a seed layer. It has been shown that the vertical growth and the crystallinity of the ZnO NRs can also be significantly improved by increasing the equimolar precursor concentrations. The morphologies of the ZnO nanorods were investigated by scanning electron microscope (SEM) and X-ray diffraction (XRD). The crystallinity properties were characterized by Raman spectroscopy and photoluminescence (PL) spectroscopy.

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Section: Introductionmentioning

confidence: 99%

The influence of precursor concentration on the crystallinity and morphology of ZnO nanorods grown on the printed circuit board substrate

Hong

2020

2020 International Conference on Information Technology and Nanotechnology (ITNT)

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“…Hence, a linear fit is more accurately represented by fitting a √ I ds versus pH plot with S units in A 1/2 pH −1 . An example plot has been previously reported by Batista and Mulato in 2005, for EGFET's S in saturation, and reported values in A 1/2 pH −1 lie between 0.26 and 1.36 µA 1/2 pH −1 . The process of getting a physically meaningful S in mV pH −1 from the EGFET I ds versus V ds output plot will be discussed with the relevant results.…”

Section: Resultsmentioning

confidence: 71%

“…Figure e,f provides similar plots for the ZnO EGFET in linear mode ( V ref = 3 V, V ds = 0.3 V) and all instances are given in Figure S4e–h (Supporting Information). S extraction in linear mode is typically reported by choosing a fixed drain current value and identifying the intersection points with V ref for different pH values . Nonetheless, this method is not recommended for two reasons.…”

Section: Resultsmentioning

confidence: 99%

A Protocol to Characterize pH Sensing Materials and Systems

et al. 2018

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Although significant progress is made in identifying pH sensing materials and device configurations, a standard protocol for benchmarking performance of next-generation pH devices is still lacking. In particular, key properties of characterization systems, such as inherent component contributions, time plots for extended-gate field-effect transistor (EGFET) measurements, and the input resistance (R in ), often go unreported in studies of pH sensing systems. These properties strongly influence the characterization system and can lead to mistaken attribution of properties to the device. In this paper, a series of essential characterization tests and parameters are reported to evaluate pH systems, such as the zinc oxide EGFET, in a standardized protocol. This EGFET ZnO sensor has a sensitivity of −58.1 mV pH −1 , drift range from 2.5 to 14.2 µA h −1 , and response time of 136 s. By using a ZnO sensing electrode, it is demonstrated that i) intrinsic contributions of reference electrode and commercial transistor (for EGFET) are not negligible; ii) time plots for EGFET configuration and defining a critical point at the onset of drift are essential for accurate sensitivity, response time, and drift reporting; and iii) the results of the pH sensing system are strongly dependent on the input resistance of the used characterization instruments. pH Sensor Benchmarking

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“…ZnO nanoproducts were prepared by hydrothermal method assisted with galvanic effect [8,10]. First, the print circuit boards served as substrates were polished by fine sand paper to remove oxide and any surface cover on top of copper layer.…”

Section: Methodsmentioning

confidence: 99%

“…ZnO is a potential candidate because it is convenient to fabricate, environmental friendly, economical, diversity in size and shape of available nanostructures [5][6][7][8][9]. In this research, ZnO nanoflowers were fabricated by a simple hydrothermal process assisted with galvanic effect.…”

Section: Introductionmentioning

confidence: 99%

Preparation of ZnO nanoflowers for surface enhance Raman scattering applications

Viet

2020

MaP

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Thanks to unique Raman spectra of chemical substances, a growing number of applications in environmental and biomedical fields based on Raman scattering has been developed. However, the low probability of Raman scattering hindered its potential development and thus, many different techniques were developed to enhance Raman signal. A key step of surface-enhanced Raman scattering technique is to prepare active SERS substrate from noble metals. The main enhancement mechanism is electromagnetic enhancement resulted from surface plasmon resonance. The disadvantages of nanoparticles based SERS substrates include high randomness due to self - assembly process of nanoparticles. Recently, a new kind of SERS substrates with order nanostructures of semiconductors combining with noble metals can serve as active SERS substrates, which are expected to possess high enhancement of Raman signals. In this study, ordered ZnO nanorods were first prepared by galvanic hydrothermal method and gold was sputtered on the as prepared ZnO nanomaterials to enhance Raman. Our SERS substrates exhibit promising high enhancement factors, and can detect chemical substances at concentration in nano molar range.

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Zinc Oxide Nanorods Grown on Printed Circuit Board for Extended-Gate Field-Effect Transistor pH Sensor

Cited by 22 publications

References 38 publications

The influence of precursor concentration on the crystallinity and morphology of ZnO nanorods grown on the printed circuit board substrate

The influence of precursor concentration on the crystallinity and morphology of ZnO nanorods grown on the printed circuit board substrate

A Protocol to Characterize pH Sensing Materials and Systems

Preparation of ZnO nanoflowers for surface enhance Raman scattering applications

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