Metal-organic framework-based nanomaterials as opto-electrochemical sensors for the detection of antibiotics and hormones: A review

• Akeem Adeyemi Oladipo,
• Saba Derakhshan Oskouei and
• Mustafa Gazi

Beilstein J. Nanotechnol. 2023, 14, 631–673, doi:10.3762/bjnano.14.52

• used to define sensor sensitivity (Figure 4). The minimum analyte concentration that can be reliably and precisely quantified is expressed by the term “limit of quantification” (LOQ). For estimation, a level of 10·Sb/S is recommended. The kinetics of both chemical recognition and signal transduction

A non-enzymatic electrochemical hydrogen peroxide sensor based on copper oxide nanostructures

• Irena Mihailova,
• Vjaceslavs Gerbreders,
• Marina Krasovska,
• Eriks Sledevskis,
• Valdis Mizers,
• Andrejs Bulanovs and
• Andrejs Ogurcovs

Beilstein J. Nanotechnol. 2022, 13, 424–436, doi:10.3762/bjnano.13.35

• be 6.5 cm2, that is, five times larger than the geometrical surface area of a bare electrode, which indicates the presence of a well-developed nanostructured surface. Figure 4 displays the dependence of the sensor sensitivity on the morphology of CuO nanostructures obtained after different periods of

A photonic crystal material for the online detection of nonpolar hydrocarbon vapors

• Evgenii S. Bolshakov,
• Aleksander V. Ivanov,
• Andrei A. Kozlov,
• Anton S. Aksenov,
• Elena V. Isanbaeva,
• Sergei E. Kushnir,
• Aleksei D. Yapryntsev,
• Aleksander E. Baranchikov and
• Yury A. Zolotov

Beilstein J. Nanotechnol. 2022, 13, 127–136, doi:10.3762/bjnano.13.9

• analytical response rates and the toxicity of the detected compounds. Since the absorption of hydrocarbon vapors is responsible for the delivery of the analyte to the photonic crystal, a change in the sensor sensitivity is possible by varying the thickness of the sensitive PDMS layer. In the experiments

Morphology-driven gas sensing by fabricated fractals: A review

• Vishal Kamathe and
• Rupali Nagar

Beilstein J. Nanotechnol. 2021, 12, 1187–1208, doi:10.3762/bjnano.12.88

• and sensor sensitivity toward ethanol and (g, h) dynamic response–recovery curve and sensor sensitivity toward methanol. Figure 15a–h was reprinted from [76], Powder Technology, vol. 217, by X. Liu; J. Zhang; T. Yang; L. Wang; Y. Kang; S. Wang; S. Wu, “Self-assembled hierarchical flowerlike ZnO

Nickel nanoparticle-decorated reduced graphene oxide/WO₃ nanocomposite – a promising candidate for gas sensing

• Ilka Simon,
• Alexandr Savitsky,
• Rolf Mülhaupt,
• Vladimir Pankov and
• Christoph Janiak

Beilstein J. Nanotechnol. 2021, 12, 343–353, doi:10.3762/bjnano.12.28

• consideration. When Ni@rGO/WO3 sensors are exposed to NO2, with NO2, which is a strong oxidizing gas accepts electrons from WO3. As a result, NO2 transforms into NO2− on the surface of WO3. This process leads to accumulation of holes and an increase in sensor sensitivity. In addition, the rGO/WO3 contact also

Multiwalled carbon nanotube based aromatic volatile organic compound sensor: sensitivity enhancement through 1-hexadecanethiol functionalisation

• Nadra Bohli,
• Meryem Belkilani,
• Juan Casanova-Chafer,
• Eduard Llobet and
• Adnane Abdelghani

Beilstein J. Nanotechnol. 2019, 10, 2364–2373, doi:10.3762/bjnano.10.227

• the vapour concentration for toluene and benzene, are presented in Figure 6a and Figure 6b, respectively, for both tested sensors. The associated sensitivities are displayed in Table 1. A dramatic increase in the HDT functionalised sensor sensitivity is observed for both vapours. The increase was from

• vapours. Conclusion In this work, we studied the detection of aromatic vapours in ppm range with a sensor composed of HDT-functionalised gold-decorated multiwall carbon nanotubes. The studied self-assembled monolayer, with its CH3 functional group, increased the sensor sensitivity (up to 17 times) and

• methanol and acetone nonaromatic VOC detection. (a) Response and (b) recovery times of Au-MWCNT and HDT/Au-MWCNT sensors towards tested vapours. Au-MWCNT and HDT/Au-MWCNT sensor sensitivity for aromatic and nonaromatic vapours. Supporting Information Supporting Information File 270: Details on the HDT/Au

Graphene-enhanced metal oxide gas sensors at room temperature: a review

• Dongjin Sun,
• Yifan Luo,
• Marc Debliquy and
• Chao Zhang

Beilstein J. Nanotechnol. 2018, 9, 2832–2844, doi:10.3762/bjnano.9.264

• sensor sensitivity to the Ni–O–C bonds formed at the interfaces of NiO nanoparticles and graphene sheets. The NO2 molecules capture electrons from the surface of NiO nanoparticles when the sensor is exposed to NO2. More and more electrons are transferred from graphene to NiO by Ni–O–C bonds because of

Effective sensor properties and sensitivity considerations of a dynamic co-resonantly coupled cantilever sensor

• Julia Körner

Beilstein J. Nanotechnol. 2018, 9, 2546–2560, doi:10.3762/bjnano.9.237

• contribute towards extending and completing the already established theoretical basics of this novel co-resonant sensor concept and open up new ways of studying the coupled system’s behaviour. Keywords: cantilever sensor; co-resonant coupling; effective sensor properties; sensor sensitivity; Introduction

• , the steps outlined here can provide the basis for such an investigation. Implications on sensor sensitivity and detectability Until a solution for the above open questions is found, the sensitivity based on the minimal detectable frequency shift of the co-resonantly coupled system can be estimated by

ZnO-nanostructure-based electrochemical sensor: Effect of nanostructure morphology on the sensing of heavy metal ions

• Marina Krasovska,
• Vjaceslavs Gerbreders,
• Irena Mihailova,
• Andrejs Ogurcovs,
• Eriks Sledevskis,
• Andrejs Gerbreders and
• Pavels Sarajevs

Beilstein J. Nanotechnol. 2018, 9, 2421–2431, doi:10.3762/bjnano.9.227

• -ion deposition process, a series of cyclic voltammetry (CV) measurements were carried out using aqueous Pb(NO3)2 solution with concentrations of 150 μM, 300 μM, 1.5 mM, and 3 mM as a source of Pb2+ ions. In order to determine and compare the sensor sensitivity to other heavy metal ions, the experiment

• was repeated with cadmium, where the same concentration of aqueous Cd(NO3)2 solution was used as a source of Cd2+ ions. The aqueous solutions of analytes were freshly prepared prior to measurement. In order to determine the sensor sensitivity threshold and quantify the change in ion concentration, a

• valid [6][7][27]. This is evidenced by lower sensor sensitivity to changes in concentrations of Cd(NO3)2: the saturation occurs by filling all possible free bonds at low concentrations (which leads to the formation of monolayers; as a result, subsequent layers are not formed due to weak bonds. Figure 5d

Perfusion double-channel micropipette probes for oxygen flux mapping with single-cell resolution

• Yang Gao,
• Bin Li,
• Riju Singhal,
• Adam Fontecchio,
• Ben Pelleg,
• Zulfiya Orynbayeva,
• Yury Gogotsi and
• Gary Friedman

Beilstein J. Nanotechnol. 2018, 9, 850–860, doi:10.3762/bjnano.9.79

• proportional to the effective sensor area. If we take the sensor sensitivity to be proportional to the area, we can significantly increase the overall sensitivity of the probe as we move the sensor further away from the pipette tip, which is also indicated in Figure 3b (curve 5 vs 1). Therefore, this analysis

Gas-sensing behaviour of ZnO/diamond nanostructures

• Marina Davydova,
• Alexandr Laposa,
• Jiri Smarhak,
• Alexander Kromka,
• Neda Neykova,
• Josef Nahlik,
• Jiri Kroutil,
• Jan Drahokoupil and
• Jan Voves

Beilstein J. Nanotechnol. 2018, 9, 22–29, doi:10.3762/bjnano.9.4

• interface is smaller than in the ZnO sensor. This could lead to a better sensitivity of the hybrid ZnO NRs/NCD sensor and a faster saturation. To confirm the sensor sensitivity to NO2 the response to different concentrations of oxygen by mixing synthetic air with nitrogen was tested at 150 °C. The sensor

Multimodal cantilevers with novel piezoelectric layer topology for sensitivity enhancement

• Steven Ian Moore,
• Michael G. Ruppert and
• Yuen Kuan Yong

Beilstein J. Nanotechnol. 2017, 8, 358–371, doi:10.3762/bjnano.8.38

• topology of the piezoelectric layer on an AFM cantilever to maximize the actuator gain and sensor sensitivity with respect to the cantilever’s higher order modes. Compared to previous work on modal sensor/actuators [42][43][44][45][46], the design specification of the presented work is to enhance the

• transfer functions are presented in section ’Experimental Results’, which highlight the actuator gain and sensor sensitivity improvements of the proposed designs. In addition, this section presents and discusses the noise characterization of the sensor. The cantilever designs presented in this work target

• actuator gain and sensor sensitivity of the piezoelectric transducer to flexural and torsional modes. First, using the finite element method, modal analysis is performed on the cantilever topology shown in Figure 1 to calculate the mode shapes. For mode 1 to mode 4 (M1–M4), the simulated mode shapes of the

High-bandwidth multimode self-sensing in bimodal atomic force microscopy

• Michael G. Ruppert and
• S. O. Reza Moheimani

Beilstein J. Nanotechnol. 2016, 7, 284–295, doi:10.3762/bjnano.7.26

• feedthrough is not compensated entirely which can be seen in the phase response. However, the de-embedded eigenmodes have enough dynamic range to be suitable for bimodal AM-AFM imaging as will be discussed in section Bimodal AFM application. Sensor sensitivity The optical lever method measures the bending

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

• improve the sensor sensitivity and selectivity towards other toxic and pollutant gases, such as hydrocarbons. A scheme of ZnO-based chemiresistive gas sensor. A) XPS spectra of the chemical elements in pristine ZnO: Zn 2p spectrum and O 1s spectra, deconvoluted in two components (O–Zn and O–C), of ZnO

Au nanoparticle-based sensor for apomorphine detection in plasma

• Chiara Zanchi,
• Andrea Lucotti,
• Matteo Tommasini,
• Sebastiano Trusso,
• Ugo de Grazia,
• Emilio Ciusani and
• Paolo M. Ossi

Beilstein J. Nanotechnol. 2015, 6, 2224–2232, doi:10.3762/bjnano.6.228

• , optical microscope observation of the sensor surface did not reveal any distinct feature when the dipping time was 2 or 5 min. It is likely that the observed change in the sensor sensitivity on the dipping time is associated with changes in the degree of surface coverage. SERS measurements of APO in blood

Gas sensing properties of nanocrystalline diamond at room temperature

• Marina Davydova,
• Pavel Kulha,
• Alexandr Laposa,
• Karel Hruska,
• Pavel Demo and
• Alexander Kromka

Beilstein J. Nanotechnol. 2014, 5, 2339–2345, doi:10.3762/bjnano.5.243

• sensor sensitivity was strongly dependent on the total surface area. In this study, we demonstrate a gas sensor based on hydrogen (H)-terminated NCD with an integrating measurement principle. The influence of the surface area (adjusted by nucleation time) and the electrode arrangement on the sensitivity

Effects of palladium on the optical and hydrogen sensing characteristics of Pd-doped ZnO nanoparticles

• Anh-Thu Thi Do,
• Hong Thai Giang,
• Thu Thi Do,
• Ngan Quang Pham and
• Giang Truong Ho

Beilstein J. Nanotechnol. 2014, 5, 1261–1267, doi:10.3762/bjnano.5.140

• voltage Vapplied. The temperature dependence of the sensor sensitivity (through voltage Vout) is shown in Figure 4a. These results indicate that the sensors have the greatest sensitivity within an operating temperature range of 200–300 °C. Among the measured sensors, the highest sensitivity was found with

• ) of ZnO and Pd/ZnO nanoparticles. PL spectra of ZnO and Pd/ZnO nanoparticles at room temperature. Dependence of (a) the operating temperature on the sensor sensitivity and (b) the hydrogen concentration on the sensor sensitivity (b). The operating temperature-dependence of (a) the sensitivity and (b

Gas sensing with gold-decorated vertically aligned carbon nanotubes

• Prasantha R. Mudimela,
• Mattia Scardamaglia,
• Oriol González-León,
• Nicolas Reckinger,
• Rony Snyders,
• Eduard Llobet,
• Carla Bittencourt and
• Jean-François Colomer

Beilstein J. Nanotechnol. 2014, 5, 910–918, doi:10.3762/bjnano.5.104

• corners and edges of particles, particularly abundant on the nanometer-sized particles [19][20]. Accordingly, the loading of gold nanoparticles has been reported to strongly influence CNT sensor sensitivity [17][21][22]. In this work we study the influence of the length of aligned CNTs decorated with gold

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

• of detail. Coating of the semiconductor with a sensitising molecule layer could enhance surface reactions or modify the surface chemistry and, hence, improve sensor sensitivity and specificity to a particular gas. Although such chemical functionalisation of impedance-based gas sensor surfaces is

Analysis of force-deconvolution methods in frequency-modulation atomic force microscopy

• Joachim Welker,
• Esther Illek and
• Franz J. Giessibl

Beilstein J. Nanotechnol. 2012, 3, 238–248, doi:10.3762/bjnano.3.27

• –Jarvis method will provide an optimal deconvolution. Besides the deconvolution algorithm, there are other uncertainties in the experimental parameters that have a direct effect on the correctness of the force deconvolution: The stiffness k, the amplitude A (sensor sensitivity) and the tip–sample distance