[Python] Smooth curve through points with prepar1d

I am trying to get a smooth curve through the data points, but the curve is not smooth and it just connects the scatter points with a straight line or it shows weird bumps in the area between the points, how can I smooth this curve?

import numpy as np
import pandas as pd
from matplotlib import pyplot as plt
import matplotlib.pyplot as plt
from matplotlib.ticker import (MultipleLocator, AutoMinorLocator)
from numpy.polynomial.polynomial import Polynomial
from scipy.interpolate import BSpline
from scipy.interpolate import interp1d
Time=[0.1,0.5,1,5,10,50,100,250,500,1000,2500,5000]
Intensity=[2722.164194,2877.627742,2663.520645,2708.928125,2545.461613,2421.236129,1885.837742,1710.483871,1275.428387,776.0895806,192.4806452,26.35279]
fun = interp1d(x=Time, y=Intensity, kind=2,bounds_error=False)
x2 = np.linspace(start=-0.1, stop=5000, num=100000)
y2 = fun(x2)
fig, ax = plt.subplots()
ax.scatter(Time, Intensity)
ax.plot(x2,y2, color="r")
ax.xaxis.set_major_locator(MultipleLocator(500))
ax.xaxis.set_minor_locator(MultipleLocator(100))
ax.yaxis.set_major_locator(MultipleLocator(500))
ax.yaxis.set_minor_locator(MultipleLocator(100))
ax.set_xlabel("Trapping time (ms)")
ax.set_ylabel("Average Intensity (counts/s)")

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