Enhancement of NO2 sensing properties of In2O3-based thin films using an Au or Ti surface modification

Steffes, H.; Imawan, Cuk; Solzbacher, Florian; Obermeier, Ε.

doi:10.1016/s0925-4005(01)00799-7

Cited by 90 publications

(34 citation statements)

References 24 publications

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“…national requirement standard 41 , and is comparable to sensors fabricated from as-grown nanotubes conventional Si substrates. Furthermore, these flexible sensors are 100-fold more sensitive than thin-film metal-oxide sensors 42,43 . We attribute this exquisite sensitivity to the fact that binding events occur near the top surface of the NWs, where most of the charge carriers reside.…”

Section: Flexible Nanowire Vapour Sensorsmentioning

confidence: 99%

Highly ordered nanowire arrays on plastic substrates for ultrasensitive flexible chemical sensors

et al. 2007

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The development of a robust method for integrating high-performance semiconductors on flexible plastics could enable exciting avenues in fundamental research and novel applications. One area of vital relevance is chemical and biological sensing, which if implemented on biocompatible substrates, could yield breakthroughs in implantable or wearable monitoring systems. Semiconducting nanowires (and nanotubes) are particularly sensitive chemical sensors because of their high surface-to-volume ratios. Here, we present a scalable and parallel process for transferring hundreds of pre-aligned silicon nanowires onto plastic to yield highly ordered films for low-power sensor chips. The nanowires are excellent field-effect transistors, and, as sensors, exhibit parts-per-billion sensitivity to NO 2 , a hazardous pollutant. We also use SiO 2 surface chemistries to construct a 'nano-electronic nose' library, which can distinguish acetone and hexane vapours via distributed responses. The excellent sensing performance coupled with bendable plastic could open up opportunities in portable, wearable or even implantable sensors.The fabrication of electronic devices on plastic substrates has attracted considerable recent attention owing to the proliferation of handheld, portable consumer electronics. Plastic substrates possess many attractive properties including biocompatibility, flexibility, light weight, shock resistance, softness and transparency [1][2][3] . However, most plastics deform or melt at temperatures of only 100−200 °C, placing severe limitations on the quality of semiconductors that can be grown directly on plastic. Central to continued advances in highperformance plastic electronics is the development of robust methods for overcoming this temperature restriction. Recently, three categories of approaches have emerged to address this problem.The first approaches are crystallization methods, in which an inferior inorganic semiconductor is vapour deposited at low temperatures onto plastic, and subsequently crystallized. An example is the conversion of amorphous silicon into polycrystalline silicon via laser crystallization 4 . Polysilicon thin-film transistors (TFTs) made in this way have yielded electron mobilities up to 250 cm 2 V −1 s −1 and hole mobilities up to 65 cm 2 V −1 s −1 (refs 5-7). However, this approach suffers from an inherent dichotomy between achieving high performance, which requires larger crystal grain sizes, and achieving homogeneity, which requires smaller grain sizes for uniformity in number of grain boundaries per © 2007 Nature Publishing Group * Correspondence and requests for materials should be addressed to J.R.H. heath@caltech.edu. Author contributions Competing financial interestsThe authors declare no competing financial interests. NIH Public Access TRANSFER OF NANOWIRES ONTO PLASTICThe dry transfer process uses the fact that the SNAP procedure is carried out on silicon-onoxide (SOI) wafers, as the buried silica can be readily etched to free the wires for transfer. Figure 1 summa...

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Section: Flexible Nanowire Vapour Sensorsmentioning

confidence: 99%

Highly ordered nanowire arrays on plastic substrates for ultrasensitive flexible chemical sensors

et al. 2007

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“…It has fascinating properties such as strong interaction between certain poisonous gas molecules and its surfaces 3 . These properties make In 2 O 3 , a remarkable material for a variety of applications such as solar cells 4 , Liquid Crystal Displays 5 , Architectural Glasses 6 , Gas Sensors 7 , Flat Panel Display 8 , and in Photo-catalytic conversions 9 . To widen the technological applications of In 2 O 3 , investigations were made to synthesize them in different forms such as nanotubes, nanobelts, nano wires and nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Effect of Capping Agent on the Morphology, Size and Optical Properties of In2O3 Nanoparticles

et al. 2017

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The Indium Oxide (In 2 O 3 ) nanoparticles were synthesized through Acacia gum mediated method with the surfactants CTAB (Cetyl Trimethyl Ammonium Bromide) and SDBS (Sodium Docecyl Benzene Sulfonate). The characterization of the synthesized In 2 O 3 nanoparticles was carried out by XRD, FTIR, RAMAN, TEM, SEM, EDAX, UV-Vis and PL techniques. TG-DTA analysis was performed to know the calcination temperature of In 2 O 3 nanoparticles. XRD analysis confirmed the crystalline nature of the synthesized In 2 O 3 nanoparticles. The morphology and chemical composition were characterized by TEM, SEM and EDAX respectively. It was observed that morphology and size of synthesized nanoparticles measured by TEM and SEM analysis were dependent on the type of capping agent (surfactant) used. Raman and UV-Vis spectral analysis confirmed that the band gap value of CTAB capped In 2 O 3 particles were larger than the SDBS capped In 2 O 3 particles. FTIR analysis indicated that the bands were stretched in In 2 O 3 particles capped by SDBS than by CTAB. From the photoluminescence studies (PL technique), a blue shift in the emission peaks of CTAB and SDBS capped In 2 O 3 particles was observed that indicates larger optical band gap than the bulk.

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“…Steffes an coworkers. outlined the improvement in the sensing properties of Indium oxides towards NO 2 in presence of Au-NPs [30]. Langmuir-Schaeffer layers of thiol-stabilized Au-NPs were proven to be sensitive towards NO 2 at the low ppm concentration level, too [31].…”

Section: Introductionmentioning

confidence: 99%

Electrosynthesis and characterization of gold nanoparticles for electronic capacitance sensing of pollutants

Cioffi

Colaianni²,

Ieva

et al. 2011

Electrochimica Acta

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In the present study, gold/surfactant core/shell colloidal nanoparticles with a controlled morphology and chemical composition have been obtained via the so-called sacrificial anode technique, carried out in galvanostatic mode. As synthesized Au-NPs had an average core diameter comprised between 4 and 8 nm, as a function of the electrochemical process experimental conditions. The UVVis characterization of gold nanocolloids showed clear spectroscopic size effects, affecting both the position and width of the nanoparticle surface plasmon resonance peak.The nanomaterial surface spectroscopic characterization showed the presence of two chemical states, namely nanostructured Au (0) (its abundance being higher than 90%) and Au (I) . Au-NPs were then deposited on the top of a capacitive Field Effect sensor and subjected to a mild thermal annealing aiming at removing the excess of stabilizing surfactant molecules. Au-NP sensors were tested towards some gases found in automotive gas exhausts. The sensing device showed the largest response towards NO x , and much smaller -if any-responses towards interferent species such as NH 3 , H 2 , CO, and hydrocarbons.

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Enhancement of NO2 sensing properties of In2O3-based thin films using an Au or Ti surface modification

Cited by 90 publications

References 24 publications

Highly ordered nanowire arrays on plastic substrates for ultrasensitive flexible chemical sensors

Highly ordered nanowire arrays on plastic substrates for ultrasensitive flexible chemical sensors

Effect of Capping Agent on the Morphology, Size and Optical Properties of In2O3 Nanoparticles

Electrosynthesis and characterization of gold nanoparticles for electronic capacitance sensing of pollutants

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