Study of the correlation between sensing performance and surface morphology of inkjet-printed aqueous graphene-based chemiresistors for NO₂ detection

• F. Villani,
• C. Schiattarella,
• T. Polichetti,
• R. Di Capua,
• F. Loffredo,
• B. Alfano,
• M. L. Miglietta,
• E. Massera,
• L. Verdoliva and
• G. Di Francia

Beilstein J. Nanotechnol. 2017, 8, 1023–1031, doi:10.3762/bjnano.8.103

• chemiresistor have been analysed upon NO2 exposure at standard ambient temperature and pressure. Moreover, as comparison, inkjet-printed sensors have been manufactured on standard insulating substrates, namely alumina (Al2O3), and silicon dioxide (Si/SiO2). They have been characterized through gas sensing and

• the one printed on Al2O3 and D-SO is fabricated on Si/SiO2. The interdigitated electrodes have 8 fingers and 7 gaps; each finger is 250 μm wide and 4000 μm long, the gap between the fingers is 860 μm. I–V curve of a chemiresistor printed on paper (D-P17). Data are collected in the range [−5 V, 5 V]. a

Gas sensing properties of MWCNT layers electrochemically decorated with Au and Pd nanoparticles

• Elena Dilonardo,
• Michele Penza,
• Marco Alvisi,
• Riccardo Rossi,
• Gennaro Cassano,
• Cinzia Di Franco,
• Francesco Palmisano,
• Luisa Torsi and
• Nicola Cioffi

Beilstein J. Nanotechnol. 2017, 8, 592–603, doi:10.3762/bjnano.8.64

• relative resistance change in percentage of the chemiresistor while exposed to the desired concentration of the target analyte m, cj (ppm) is the concentration value of the target analyte, and n is the number of gas exposures for each analyte. Results and Discussion Chemical and structural properties of

• detection in environmental monitoring. TEM images of electrochemically synthesized core–shell A) Au NPs and B) Pd NPs. Schematic view of the two-pole chemiresistor based on a MWCNT network functionalized with metal NPs. XPS core level spectrum of A) Au 4f and B) Pd 3d on functionalized MWCNTs. SEM images of

Sensitive detection of hydrocarbon gases using electrochemically Pd-modified ZnO chemiresistors

• Elena Dilonardo,
• Michele Penza,
• Marco Alvisi,
• Gennaro Cassano,
• Cinzia Di Franco,
• Francesco Palmisano,
• Luisa Torsi and
• Nicola Cioffi

Beilstein J. Nanotechnol. 2017, 8, 82–90, doi:10.3762/bjnano.8.9

• , in which each sensor system is selective in the detection of a specific gas. Conclusion The successful electrochemical functionalization of ZnO NRs by Pd NPs is reported. The gas sensing properties of pristine and Pd-modified rod-like ZnO-based chemiresistor revealed that the presence of catalytic Pd

Evaluation of gas-sensing properties of ZnO nanostructures electrochemically doped with Au nanophases

• Elena Dilonardo,
• Michele Penza,
• Marco Alvisi,
• Cinzia Di Franco,
• Francesco Palmisano,
• Luisa Torsi and
• Nicola Cioffi

Beilstein J. Nanotechnol. 2016, 7, 22–31, doi:10.3762/bjnano.7.3

• parts of the dynamic response curve shown in A at a NO2 concentration of 10 ppm drawn to illustrate the moments of gas input and gas stop. Calibration curves in terms of the percentage relative electrical resistance change for a chemiresistor based on pristine and Au@ZnO annealed at A) 300 °C and B) 550

Chemiresistive/SERS dual sensor based on densely packed gold nanoparticles

• Sanda Boca,
• Cosmin Leordean,
• Simion Astilean and
• Cosmin Farcau

Beilstein J. Nanotechnol. 2015, 6, 2498–2503, doi:10.3762/bjnano.6.259

• demonstrated by the detection of a biologically relevant model analyte, 4-mercaptophenyl boronic acid. Keywords: colloidal nanoparticles; convective self-assembly; interparticle gaps; surface enhanced Raman scattering; chemiresistor; Introduction The development of optical sensors is still following an

• monitoring. Assemblies of gold NPs were recently proposed as chemiresistor sensors, exhibiting reliable responses to the analyzed compounds [4]. In most cases very small particles were used (3–7 nm), functionalized with specific ligands that facilitate their assembly into thin nanoparticle films through

• demonstration of a dual electrical/optical sensing concept based on gold nanoparticles, combining unique advantages of both chemiresistor and SERS sensors. Results and Discussion Dual sensing concept The main idea of this work stems from the fact that the same physical systems (noble metal colloids) and the

Functionalised zinc oxide nanowire gas sensors: Enhanced NO₂ gas sensor response by chemical modification of nanowire surfaces

• Eric R. Waclawik,
• Jin Chang,
• Andrea Ponzoni,
• Isabella Concina,
• Dario Zappa,
• Elisabetta Comini,
• Nunzio Motta,
• Guido Faglia and
• Giorgio Sberveglieri

Beilstein J. Nanotechnol. 2012, 3, 368–377, doi:10.3762/bjnano.3.43

• an effect that is likely to modify the chemiresistor response significantly [3]. ZnO is one of the most widely studied materials, due to its promising optical, optoelectronic and piezoelectric properties [9][10]. Furthermore, ZnO materials can be reliably synthesised in a variety of different

• on the gas response. We investigated the chemiresistor response towards ammonia, nitrous oxide and nitrogen dioxide. Results and Discussion The morphology, surface roughness and evenness-of-coating of the ZnO nanowire sensors were examined by scanning electron microscopy. SEM images of each sensor

• dynamic responses of the THMA-functionalised ZnO-nanowire-based chemiresistor gas sensors are given in Figure 7a and Figure 7b, as operated at the comparatively low temperature of 190 °C. It is interesting to note that all three of the replicas of these sensors possessed a consistent enhanced sensitivity

Surface functionalization of aluminosilicate nanotubes with organic molecules

• Wei Ma,
• Weng On Yah,
• Hideyuki Otsuka and
• Atsushi Takahara

Beilstein J. Nanotechnol. 2012, 3, 82–100, doi:10.3762/bjnano.3.10

• -substituted polythiophene systems was reported [84]. Using a simple solution fabrication process, by dispersing carbon nanotubes in a polythiophene solution followed by spin coating of the solution onto a glass substrate, a highly sensitive and selective chemiresistor was successfully developed. Due to the