## 1 Introduction  
The stagnation-point flow is a flow that explains the behavior of the fluid motion near the stagnation region. This type of flow happens when the flow hits the solid surface and the fluid velocity at the stagnation-point equals zero. Some applications has been reported where the stagnation-point flow is applied, for instance in dentistry by [PERSON] et al. [1], and air purification as presented by [PERSON] et al. [2]. Recently, the study on the flow over an exponential stretching/shrinking sheet has received more attention than for ordinary stretching/shrinking sheets due to its wider applications, as mentioned by [PERSON] et al. [3]. Further, [PERSON] et al. [4] studied the unsteady boundary layer flow and heat transfer passes through an exponential shrinking sheet in a Copper water nanofluid with the presence of a suction effect. The effects of joule heating and thermal radiation on the Magnetohydrodynamics (MHD) boundary layer flow over an exponential stretching sheet in a porous medium immersed in nanofluid was investigated by [PERSON] et al. [5]. Furthermore, [PERSON] et al. [6] applied the Buongiorno model to study the flow and heat transfer over an exponential sheet in nanofluid. However, there are only a few works that studied the stagnation-point flow over the exponential sheet, e.g., [PERSON] et al. [7], who applied the Tiwari and Das model to study the flow and heat transfer over an exponential stretching/shrinking sheet. [PERSON] et al. [8] considered the stagnation-point flow as well as the heat transfer passing through an exponential shrinking sheet. Instead of an exponentially shrinking sheet, [PERSON] et al. [9] in their work studied the MHD stagnation-point flow of a nano-material over an exponentially stretching sheet in a three-dimensional system using the Tiwari and Das model. They considered three types of nanoparticles, namely Copper oxide, Magnetite, and Alumina, whilst water was chosen as the base fluid. Practical applications can be found in industrial processes such as the cooling of extruded materials by inward-directed fan or conical liquid jets, as mentioned by [PERSON] et al. [10]. A new class of heat transfer fluid, namely nanofluid, is introduced by [PERSON] and [PERSON] [11], due to the low thermal conductivity property demonstrated by the base fluids. This kind of fluid can be obtained by diffusing nanoparticles into base fluids such as water, ethanol glycol, and oil, which increases the surface area for transferring heat. Meanwhile, there are two types of nanofluid models that can be considered in investigations of the behavior of the nanofluid: the Boungiorno [12] and the Tiwari and Das models [13]. The Tiwari and Das model, also known as the \"single phase\" model, studies the effects of nanoparticle volume fractions for different nanoparticles, whilst the Boungiorno model or \"two phase\" model focuses on Brownian motion and the thermophoresis effects of the nanoparticles. In addition, a comparison between the single phase and two phase nanofluid models has been undertaken numerically by [PERSON] et al. [14] for turbulent forced convection; it was found that the results from the single phase model approach the results from experimental findings compared to those obtained from a two phase model for almost conditions. A part from that, the thermal performance of the nanofluid can be affected by considering different types, nanoparticle volume fractions, sizes, as well as diameters of the nanoparticles, as studied by [PERSON] et al. [15] and [PERSON] et al. [16], who found that nanofluids can be considered an excellent choice for any application which seeks to optimize heat transfer processes. Hence, the emergence of nanofluids was a milestone in heat transfer enhancement, which is required in many fields, for example, energy saving, refrigeration systems, solar collector, and the automotive industry. These examples of nanofluid applications are discussed in in numerous papers [17; 18; 19; 20; 21].