In 2017, Singh et al. [
57] reported a selective nanozyme-based method for the quantification of malathion utilizing the peroxidase-mimicking properties of palladium-gold nanorods. The O- phenylenediamine was used as the chromogenic compound for the detection purpose upon its oxidation by hydrogen peroxide catalyzed by palladium-gold nanozyme. A LOD as low as 60 ng mL
-1 was obtained for the detection of malathion along with a recovery percentage of 80–106%. The reproducibility of the sensor was found to be 2.7-6.1% and 3.2-5.9% intra and inter-assay, in turn. In 2017, Zhang et al. [
58] immobilized modified the Cu(II)-based MOF-74 and employed them for the sensitive electrochemical detection of 2,4,6-trichlorophenol. XRD, FT-IR, SEM, UV-Vis., and CV measurements were performed for investigation of composite properties. A wide linear range over 0.01-9 μM and LOD of about 0.005 μM was achieved for the determination of 2,4,6-trichlorophenol. The repeatability studies showed an RSD% of 4.6% for determination of 0.5 5 μM 2,4,6-trichlorophenol. In 2018, Chen et al. [
59] synthesized honeycomb-like zinc-doped Ni(II)-based MOF with spherical particles using HCl as the modulator upon a microwave-assisted method. The resulting MOFs were used as electrode materials, showed a specific capacity of 237.4 mA h g
-1 for 1 A g
-1 which can be used as supercapacitor material. In 2018, Yu et al. [
60] designed a new sensor for the Pb(II) detection using a Fe(II)-MOFs/Pd-Pt alloys composites via a target-triggered nuclear acid cleavage of Pb
2+-specific DNAzyme. Moreover, the DNAzyme was immobilized on streptavidin-modified reduced graphene oxide-tetraethylene pentamine-gold nanoparticles for use as the sensor platform. By introducing the Pb(II), the DNA was cleaved by the DNAzyme and a new single strand of DNA was produced. In the presence of Pb
2+, the substrate DNA strand can be specifically cleaved at the ribonucleotide site by DNAzyme to produce a new single-DNA on the interface. Then, the single-strand DNA was used for modification of Fe-MOFs/PdPt NPs for signal amplification. The sensor showed a linear range over 0.005-1000 nM and a LOD of 2 pM (S/N =3) for Pb(II) determination in drinking water. In 2018, Li et al. [
61] synthesized and characterized a new iron-base MOF@palladium nanoparticles composite via assembly palladium nanoparticles on the surface of NH
2-Fe-MIL-88. The composite was used for the determination of microRNA-122 by the electrocatalytic oxidation of 3,3′,5,5′-tetramethylbenzidine in the presence of H
2O
2 catalyzed by the developed nanocomposite with intrinsic peroxidase-like activity. A working range over 0.01 fM-10 pM along with a LOD of 0.003 fM (S/N =3) was obtained. In 2018, Lopa et al. [
62] used a microwave-assisted solvothermal route for the synthesis of a novel base-stable Cr(III)-MOF and utilized it for the non-enzymatic quantification of hydrogen peroxide via its electro-reduction in 0.1 M NaOH through the redox process of Cr(III)/Cr(II) in the Cr (III)-MOF. A working range of 25-500 mM and a LOD of 3.52 mM was provided for hydrogen peroxide determination. In 2018, Wang et al. [
63] used the Ru, Ir, and Pt-based nanozymes for developing a nanozyme sensor array toward biothiols and proteins determination as well as cancer cells discrimination. The sensor array can accurately identify 42 of 45 proteins and 28 of 30 biothiols which makes it applicable for biothiols detection in blood and protein discrimination in urine samples. In 2019, Xue et al. [
64] reported a new nanocomposite of silver nanoparticles with amino-functionalized multi-walled carbon nanotubes with high water-processibility, environmental stability, and electrocatalytic capacity via the ultrasonic-assisted liquid-phase exfoliation method. The nanocomposite was then dispersed in carboxymethyl cellulose sodium and applied for the development of electrochemical sensors for single/simultaneous determination of xanthine, uric acid, and hypoxanthine, showing a working range of 0.5–680 μM (LOD=0.021 μM), 0.1–800 μM (LOD= 0.052 μM), and 0.7–320 μM (LOD=0.025 μM), in order. In 2020, Zhu et al. [
65] fabricated a nanozymatic sensor array for the detection of aromatic pesticides using heteroatom-doped graphene. The enzyme-like activity of nanozyme was inhibited in the presence of the different pesticides with a characteristic distinguish between them. This sensor array can determine the lactofen, bensulfuron-methyl, fluoroxypyr-meptyl, diafenthiuron, and fomesafen over 5-500 μM. The array was practically applied for the analysis of soil samples. In 2020, Hormozi Jangi et al. [
49] developed a novel naked-eye method for field detection of notorious explosive triacetone triperoxide via the oxidation of 3, 3′-diaminobenzidine in the presence of hydrogen peroxide produced from the acidic decomposition of triacetone triperoxide catalyzed by MnO
2 nanozymes. A linear range of 1.57-10.50 mg L
−1, a LOD of 0.34 mg L
−1, and a fast spot test analyzing time of 5 s were provided. Since the DAB oxidation was selectively proceeded by hydrogen peroxide not, by molecular oxygen, hence, this method can be eliminated the common false-positive results from laundry detergents. In 2020, Lin et al. [
66] synthesized the gold alloy-based nanozymes which showed better catalytic performances than the common gold nanoparticles. The developed nanozymes were used for the discrimination of cysteine, glutathione, mercaptoacetic acid, dithiothreitol, mercaptosuccinic acid, and mercaptoethanol in the human serum samples. In 2021, Soltani et al. [
67] synthesized and characterized a carboxylic acid-functionalized layered double hydroxide/MOF nanocomposite via growing the UiO-66-(Zr)-(COOH)
2 MOF on the surface of COOH-functionalized Ni
50Co
50- layered double hydroxide nanosheets at 100 °C. The product was used for Cd(II) and Pb(II) removal from the water via surface adsorption mechanism, showing an adsorption capacity of 415.3 and 301.4 mg g
−1 for Cd(II) and Pb(II), in turn. The method showed a Langmuir adsorption isotherm and a pseudo-first-order kinetic model. In 2021, Butova et al. [
68] reported a scalable route for the synthesis of MOF-801. They evaluated the effect of the concentration of mono-carboxylic acids on the water and hydrogen uptake, porosity, crystallinity, size, and shape of particles. They revealed that heating and small grains in powders are suitable for the fast release of water. The properties of the MOF-801 can enhance by both formic and acetic acid. The resulted MOF-801 showed 1.1 wt% hydrogen uptake at 750 mmHg and 20% water uptake at ambient temperature. In 2021, He et al. [
69] prepared stable MOF based on porphyrinic for the encapsulation of metal nanoparticles via stirring at ambient temperature. In this regard, Pt NPs encapsulated into the MOF can be produced by stirring the Pt NPs solution in the presence of the MOFs. In 2021, Kang et al. [
70] reported a nanozyme based sensor for the determination of dopamine using hemin-doped-HKUST-1. The hemin-doped-HKUST-1 was prepared using a one-pot hydrothermal method and combined with reduced graphene oxide modified on a glassy carbon electrode. The composite exhibited high electrocatalytic activity toward electro-oxidation of dopamine. Using this sensor, a linear range of 0.03–10 μM and a LOD of 3.27 × 10
−8 M (S/N = 3) was obtained for the quantification of dopamine. In 2021, Hermosilla et al. [
71] proposed a new colorimetric method for assaying the oxidase-mimicking properties of MnFe
2O
4 NPs (size, 3.19 nm). The protocol was based on the oxidation of 3-methyl-2-benzothiazolinone-hydrazone to 3-(dimethylamino) benzoic acid. The pH and temperature effect on the assay response was evaluated, revealing an optimum pH of 3.9 at 30 °C. The Michaelis Menten model supported the kinetic behavior of the nanozyme catalyzed reaction, obtaining a
Km of 13.59 µM and a
kcat of 5.25 × 10
7 s
−1 along with a
kcat/
Km ratio of 3.86 × 10
12 M
−1 s
−1. In 2022, Wu et al. [
72] developed a MnO
2 nanozyme-mediated CRISPR-Cas12a system for naked-eye diagnosis of COVID-19. In this system, the MnO
2 nanorods were initially linked to magnetic beads using a single-stranded DNA (ssDNA). The as-prepared nanozymes show high oxidase-like activity and can catalyze the oxidation of TMB to a blue-colored product. However, the detection color will change by activation of Cas12a by SARS-CoV-2 and cleaving the ssDNA which was used as a basis for the detection of SARS-3CoV-2. In 2023, He et al. [
73] performed a nanozyme-based colorimetric method for naked-eye diagnosis of COVID-19 by iron manganese silicate nanozymes as peroxidase-like nanozymes. The nanozymes activity can be inhibited by introducing the pyrophosphate ions which are generated by amplification processes and can be used for optical diagnosis of COVID-19. Besides, Chu et al. (2023) [
74] developed a robust colorimetric immunosensing method using liposome-encapsulated MnO
2 nanozymes for diagnosis of COVID-19 via detection of SARS-CoV-2 antigen using TMB as the chromogenic substrate. Moreover, Vafabakhsh et al. (2023) [
75] reported a paper-based colorimetric nanozyme-based sensor for diagnosis of COVID-19 using aptamer-modified ChF/ZnO/CNT nanohybrids as peroxidase mimics and TMB as the chromogenic substrate.